用户可以设置STC15W4K32S4系列的单片机的每路PWM的初始电平。

The Economist calculates that around the world almost 290 million 15- to 24-year-olds are neither working nor studying: almost a quarter of the planets youth. On the other hand, many of the "employed" young have only informal and【C1】______jobs. In rich countries more than a third, on average, are on temporary【C2】______which make it hard to【C3】______skills In poorer ones, according to the World Bank, a fifth are【C4】______family labourers or work in the informal economy.【C5】______, nearly half of the worlds young people are either【C6】______the formal economy or contributing less【C7】______than they could. What has caused this【C8】______of joblessness? Young people have long had a raw【C9】______in the labour market. Two things make the problem more【C10】______now. The financial crisis and its consequence had an unusually big【C11】______on them. Many employers【C12】______the newest hires first, so a【C13】______raises youth joblessness disproportionately. Second, the emerging economies that have the largest and fastest-growing【C14】______of young people also have the【C15】______labour markets. Almost half of the worlds young people live in South Asia, the Middle East and Africa They also have the highest【C16】______of young people out of work or in the informal sector. In rich countries with generous welfare states this【C17】______a heavy burden on taxpayers. One estimate suggests that, in 2011, the economic loss from【C18】______young people in Europe【C19】______to $153 billion, or more than 1% of GDP. And failure to employ the young not only【C20】______growth today. It also threatens it tomorrow.

【C1】

A．regular

B．alternate

C．continuous

D．intermittent

一养鸟者有10只鸟：

种类 雄性 雌性

G H J，K

L M N

P Q，R，S T，W

该养鸟者展示数对鸟，每对鸟由同一种类的一雄一雌构成。每次最多只能展示2对鸟，剩余的鸟必须被分置在2个鸟笼中。该养鸟者受以下条件的限制：

(1)每个笼子中的鸟不能超过4只；

(2)同一种类相同性别的两只鸟不能放在同一个笼子中；

(3)了或W被展示时，S不能被展示。

下面哪一种对鸟的分配是可以接受的? 第一笼 第二笼 展示

A．H，M，N J，K，S Q，R，T，W

B．K，M，Q N，R，W H，J，S，T

C．K，Q，S R，T，W H，J，M，N

D．H，J，M，R K，N，S，W Q，T

46～50题基于以下题干；

一养鸟者有10只鸟：

种类雄性雌性

O H J，K

L M N

P Q，R，S T，W

该养鸟者展示数对鸟，每对鸟由同一种类的一雄一雌构成。每次最多只能展示2对鸟：剩余的鸟必须被分置在2个鸟笼中。该养鸟者受以下条件的限制：

(1)每个笼子中的鸟不能超过4只；

(2)同一种类相同性别的两只鸟不能放在同一个笼子中；

(3)J或W被展示时，S不能被展示。

下面哪一种对鸟的分配是可以接受的?

第一笼 第二笼 展示

A． H，M，N J，K，S Q，R，T，W

B． K，M，Q N，R，W H，S，T

C． K，Q，S R，T，W H，J，M，N

D． H，J，M，R K，N，S，WQ，T

基于以下题干，回答问题

一养鸟者有10只鸟：

种类 雄性 雌性

O H J，K

L M N

P Q，R，S T，W

该养鸟者展示数对鸟，每对鸟由同一种类的一雄一雌构成。每次最多只能展示2对鸟：剩余的鸟必须被分置在2个鸟笼中。该养鸟者受以下条件的限制：

(1)每个笼子中的鸟不能超过4只；

(2)同一种类相同性别的两只鸟不能放在同一个笼子中；

(3)J或W被展示时，S不能被展示。

下面哪一种对鸟的分配是可以接受的? 第一笼 第二笼 展示

A．H，M，N J，K，S Q，R，T，W

B．K，M，Q N，R，W H，S，T

C．K，Q，S R，T，W H，J，M，N

D．H，J，M，R K，N，S，W Q，T

听力原文：W: What's the time now?

M: It's fifteen to five.

What time is it now?

A．4:45．

B．4:10

C．5:15

听力原文：Woman: Can I help you?

Man: Sure. I'd like to book an airline ticket here.

W: Which airlines do you prefer?

M: I don't have any particular airlines in mind. Any one safe, reliable and reasonable is O.K. with me.

W: Where is your destination?

M: (4[C])London.

W: From here?

M: Yes, from Norfolk International to London Heathrow Airport.

W: When would you like to leave?

M: (5IAI)Friday, the coming Friday.

W: There're dozen flights to London. Which do you prefer, morning, afternoon or night flight?

M: Is there any difference in price?

W: Yes. Generally speaking, the night flight is cheaper. Are you taking single or return?

M: Return. I'll be back Monday evening.

W: And economy class?

M: Yes.

W: You'll have our weekend bargain price. It's $480.

M: That's acceptable. Which airlines?

W: The US Air and the British Airways.

M: You mean I'll have to change.

W: Yes, at Dullas Airport, Washington D. C.

M: What time?

W: You leave Norfolk International at 9:55 p.m and Dullas at 11:50 p.m.

M: How long does the trip take?

W: About 5 hours, You'll be there in the morning.

M: That's O.K. with me.

W: Can I have your name please?

M: John Smith.

W: John Smith. Shall I write your tickets now?

M: Wait a minute. How much luggage can I take onto the plane? I've got some documents and have to take good care of them.

W: It's 5 kilos. You may just take your documents with you and leave the other luggage to the airlines.

M: That's a good idea.

W: You'll return from Heathrow at 6 p. m Monday and arrive at Dullas, 7 p.m. Is that all right?

M: That's perfect. Please make my tickets O.K.

W: Sure. You don't have to have your return ticket confirmed.

M: Do you accept the credit card?

W: (6[B])Yes. Please sign your name here. Thank you. Here you are, credit Card, tickets and receipt.

M: I appreciate it.

W: You're welcome.

where is the man going?

A．Dullas.

B．Norfolk.

C．London.

D．Washington Ｄ.Ｃ.

The sentence "We are trying to think out of the box" (Para, 4) suggests that_____.

A．they will try to find wisdom out of the box

B．they will probe deep into the pools of academy

C．they will break away from the conventions

D．they will pursue their traditional approach

单位掘进循环开挖土量，一般按( )计算。

A．V＝100Q/(Gs.W+100)

B．Q＝πD2St/4

C．V3＝[(G2-1)Q2-(G2-1)Q2]/(G2-1)

D．Q＝λπ(D2-d2)L/4

第二节 完型填空

阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中选出能填入相应空白处的最佳选项。

The report came to the British on May 21, 1941. The German battleship Bismarck, the mot【B1】warship in the world, was moving out into the Atlantic Ocean. Her task was to destroy the ships 【B2】supplies from the United States to warn-torn England. The British【B3】such a task. No warship they had could【B4】the Bismarck in【B5】or in firepower. The Bismarck had eight 15-inch guns and 81 smaller guns. She could move at 30 nautical mile (海里) an hour. She was believed to be unsinkable. However, the British had to【B6】her. They sent out a task force【B7】by their best battleship Hood to hunt down the Bismarck. On May 24, the Hood found the Bismarck.

It was a【B8】that the German commander (指挥官)did not want to see. His orders were【B9】the British ships that were carrying【B10】, but to stay away from a fight with British warships.

The battle didn't last long. The Bismarck's first torpedo (鱼雷)【B11】the Hood, which went down taking all but three of her 1,419 men with her.

But in the【B12】, the Bismarck was slightly damaged. Her commander decided to run for repairs【B13】France, which had【B14】been taken by the German. The British force【B15】her.【B16】, because of the Bismarck's speed and the【B17】fog, they lost【B18】of her.

For two days, every British ship in the Atlantic【B19】find the Bismarck, but with no success. Finally, she was sighted by a plane from Ireland. Trying to slow the Bismarck【B20】so that their ships could catch up with her, the British fired at her from the air. The Bismarck was hit.

On the morning of May 27th, the last battle was fought. Four British ships fired on the Bismarck, and she was finally sunk.

【B1】

A．powerful

B．long

C．quick

D．heavy