Extraction efficiency = （Loss from the exit cavity end) / （Total loss)

Radesky has studied the use of mobile phones and tablets at mealtimes by giving mother-child pairsa food-testing exercise. She found that mothers who sued devices during the exercise started 20percent fewer verbal and 39 percent fewer nonverbal interactions with their children. During aseparate observation, she saw that phones became a source of tension in the family. Parents wouldbe looking at their emails while the children would be making excited bids for their attention. Infants are wired to look at parents’ faces to try to understand their world, and if those faces areblank and unresponsive—as they often are when absorbed in a device－it can be extremely7disconcerting foe the children. Radesky cites the “still face experiment ” devised by developmentalpsychologist Ed Tronick in the 1970s.

In it, a mother is asked to interact with her child in a normalway before putting on a blank expression and not giving them any visual social feedback; The childbecomes increasingly distressed as she tr ies to capture her mother ’s attention. "Parents don&39;t have tobe exquisitely parents at all times, but there needs to be a balance and parents need to be responsiveand sensitive to a child ’s verbal or nonverbal expressions of an emotional need," says Rade sky. On the other hand, Tronick himself is concerned that the worries about kids&39; use of screens are bornout of an “oppressive ideology that demands that parents should always be interacting children: “It’s based on a somewhat fantasized, very white, very upper-middle-class ideology thatsays if you’re failing to expose your child to 30,000 words you are neglecting them.”

Tronickbelieves that just because a child isn ’t learning from the screen doesn ’t mean there －particularly if it gives parents time to have a shower, do housework or simply have a break fromtheir child. Parents, he says, can get a lot out of using their devices to speak to a friend or get somework out of the way. This can make them feel happier, which lets then be more available to theirchild the rest of the time.

26.According to Jenny Radesky, digital products are designed to ______.

A.simplify routine matters

B.absorb user attention

C.better interpersonal relations

D.increase work efficiency

Radesky’s food -testing exercise shows that mothers ’ use of devices ______.A.takes away babies ’ appetite

B.distracts children ’s attention

C.slows down babies ’ ver bal development

D.reduces mother-child communication

Radesky’s cites the “still face experiment ” to show that _______.A.it is easy for children to get used to blank expressions

B.verbal expressions are unnecessary for emotional exchange

C.children are insensitive to changes in their parents ’ mood

D.parents need to respond to children's emotional needs

The oppressive ideology mentioned by Tronick requires parents to_______.A.protect kids from exposure to wild fantasies

B.teach their kids at least 30,000 words a year

C.ensure constant interaction with their children

D.remain concerned about kid's use of screens

According to Tronick, kid ’s use of screens may_______.A.give their parents some free time

B.make their parents more creative

C.help them with their homework

D.help them become more attentive

Radesky has studied the use of mobile phones and tablets at mealtimes by giving mother-child pairs a food-testing exercise. She found that mothers who sued devices during the exercise started 20 percent fewer verbal and 39 percent fewer nonverbal interactions with their children. During a separate observation, she saw that phones became a source of tension in the family. Parents would be looking at their emails while the children would be making excited bids for their attention.

Infants are wired to look at parents’ faces to try to understand their world, and if those faces are blank and unresponsive—as they often are when absorbed in a device—it can be extremely disconcerting foe the children. Radesky cites the “still face experiment” devised by developmental psychologist Ed Tronick in the 1970s. In it, a mother is asked to interact with her child in a normal way before putting on a blank expression and not giving them any visual social feedback; The child becomes increasingly distressed as she tries to capture her mother’s attention. “Parents don’t have to be exquisitely parents at all times, but there needs to be a balance and parents need to be responsive and sensitive to a child’s verbal or nonverbal expressions of an emotional need,” says Radesky.

On the other hand, Tronick himself is concerned that the worries about kids’ use of screens are born out of an “oppressive ideology that demands that parents should always be interacting” with their children: “It’s based on a somewhat fantasized, very white, very upper-middle-class ideology that says if you’re failing to expose your child to 30,000 words you are neglecting them.” Tronick believes that just because a child isn’t learning from the screen doesn’t mean there’s no value to it—particularly if it gives parents time to have a shower, do housework or simply have a break from their child. Parents, he says, can get a lot out of using their devices to speak to a friend or get some work out of the way. This can make them feel happier, which lets then be more available to their child the rest of the time.

26. According to Jenny Radesky, digital products are designed to ______.

A.simplify routine matters

B.absorb user attention

C.better interpersonal relations

D.increase work efficiency

The oppressive ideology mentioned by Tronick requires parents to_______.A.protect kids from exposure to wild fantasies

B.teach their kids at least 30,000 words a year

C.ensure constant interaction with their children

D.remain concerned about kid’s use of screens

Radesky’s food-testing exercise shows that mothers’ use of devices ______.A.takes away babies’ appetite

B.distracts children’s attention

C.slows down babies’ verbal development

D.reduces mother-child communication

According to Tronick, kid’s use of screens may_______.A.give their parents some free time

B.make their parents more creative

C.help them with their homework

D.help them become more attentive

Radesky’s cites the “still face experiment” to show that _______.A.it is easy for children to get used to blank expressions

B.verbal expressions are unnecessary for emotional exchange

C.children are insensitive to changes in their parents’ mood

D.parents need to respond to children’s emotional needs

设f(x,y)在闭区域D={(x,y)|x²+y²≤y,x≥0|上连续,且

求f(x,y)。

We start with a session today on a key issue for us-company strategy. Alex will lead that. I think you'll be interested in the ideas he's going to talk about. In the next session, from the coffee break until lunchtime, we'd like you to think about what these ideas mean for each country we work in. I think we've called that 'Workshops' in the schedule.

We've left you some free time before dinner. There are drinks in the hotel lounge at seven o'clock Please all meet there before moving into the Blue Room for the meal itself.

Tomorrow, Sunday, we start at 9 am. Alex wanted to schedule a product demonstration. I'd also hoped to fit in sales training. We finally derided to go with Alex's idea. Please can you be ready to start the session punctually. That session's followed by one called 'Discussion Groups', where we'll be looking at issues raised during the first session of the day. But we hope you'll not only talk but also think of an action plan by the end of the session.

We haven't scheduled a sit-down lunch for tomorrow. Instead, we'll have a buffet at 12.30. That'll leave time for our guest speaker, Susan James. Most of you know her from last year, and I'm sure you'll all be interested in what she has to say about customer contact. Her session will include some reports from research about how clients feel when approached by salespeople and how this experience can be imp'roved.

And then at five o'clocK the coach will take us all to the airport. Right, that's enough of the introductions. Let's now start the first session.

How to approach Listening Test Part Three

？In this part of the Listening Test you listen to a monologue, e.g. a presentation.

？Before you listen, read the notes. Think about the presentation you will hear

？Note all possible answers as you listen for the first time. Do not make an immediate decision.

？Do not worry if you do not know the answers. You will hear the recording a second time.

？Listen for overall meaning. Do not choose an answer just because you hear the same words in the recording as in the question.

？Decide on your final answer only after you have listened for the second time.

？Check that you have used no more than two words in each numbered space.

？Look at the conference programme below.

？Some information is missing.

？ZYou will hear part of a welcome speech by a company's Sales Director.

？For each question 16 - 22, fill in the missing information in the numbered space using one or two words.

？You will hear the speech twice.

Fashion House

International Sales Conference 2002

Conference Programme

Saturday

9.00 Session 1: Talk by the Managing Director about (16) ..................

10.30 Coffee

11.00 Session 2: (17) ..................

12.30 Lunch

Free time

19.00 Meet in the (18) ..................

Sunday

9.00 Session 1: (19) ..................

10.30 Coffee

11.00 Session 2: (20) ..................

12.30 (21) .................. (lunch)

14.00 Final session: Talk by guest speaker Susan James on (22) ..................

17.00 Coach to the airport

(16)

A. 单开

B. 对称

C. 渡线

D. 临时

Using?Database?Control，?you?have?scheduled?a?job?to?shrink?the?TRANS?table?residing?on?the?TT?tablespace.?The?job?would?run?at?5：00?p.m.?every?Friday.?

When?you?examine?the?space?usage?of?the?table?after?the?completion?of?the?job，?you?find?that?the?table?has?not?been?shrunk.?

What?could?have?been?the?reason?for?this？（）

A. The?tablespace?that?contains?the?TRANS?table?is?online.

B. The?tablespace?that?contains?the?TRANS?table?is?permanent.

C. The?tablespace?that?contains?the?TRANS?table?is?locally?managed.

D. The?segment?space?management?of?the?tablespace?that?contains?the?TRANS?table?is?manual?in?nature.

xⁿ／n在｜x｜<1的和函数是：（）

A. ln（1-x）

B. ln[1／（1-x）］

C. ln（x-1）

D. -ln（x-1）