Astragalus could inhibit the expression of proapoptotic genes and enhance that of inhibiting-apoptotic genes in ischemia area after cerebral ischemia.

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第1题

The expression, re = [图], shows that ______.A、re ...

The expression, re =, shows that ______.

A、re is a constant value that is determined by the internal structure of the transistor

B、the emitter-base voltage for the configuration is a constant 26 mV (as opposed to 700 mV for a forward-biased, common-emitter BJT configuration)

C、it is rather easy to determine the correct value for the emitter resistor

D、the ac input resistance of the configuration is determined by the amount of dc emitter current

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第2题

Match the expressions with their English meanings....

Match the expressions with their English meanings. 1. luggage （） 2. overweight （） 3. aisle seat （） 4. scale （） 5. passport （） 6. carry-on （） 7. boarding pass（） 8. check-in counter（） 9. escalator （） 10. sign （） A. a machine or device for weighing. B. a set of moving stairs that take people to different levels in a building. C. a small official document that you get from your government, that proves who you are, and which you need in order to leave your country and enter other countries. D. the cases, bags etc. that you carry when you are traveling. E. a pass that a passenger has to show when boarding a plane, ferry, etc. F. a piece of paper, metal or wood with words or a picture that gives people information, warnings or instructions. G. extra or excess weight. H. a seat, esp. on a plane, situated adjacent to the aisle. I. the bag that you take inside an aeroplane with you.

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第3题

Aesthetics is broader in scope than the philosophy of art, which comprises one of its branches.【21】It deals not only with the nature and value of the arts but also with responses to natural objects that find expressions in the language of the beautiful and the ugly.【22】A problem is encountered in the outset, however, for terms such as beautiful and ugly seem too vague in their application.【23】Almost anything might be seen as beautiful by someone or from some point of view; and different people apply the word to quite disparate objects for reasons that often seem having little or nothing in common.【24】It may be that there is some single underlying believe that motivates all of their judgments.【25】It may also be, however, that the term beautiful has no sense except as the expression of an attitude, which is in return attached by different people to quite different state of affairs.

【26】Moreover, in spite of the emphasis lay by philosophers on the terms beautiful and ugly, it is far from evident that they are the most important or most useful either in the discussion and criticism of art or in the description of that which appeals to us in nature.【27】Conveying what is significant in a poem, we might use such terms as ironical, moving, expressive, balanced, and harmonious.【28】Likewise, in describing a favorite stretch of countryside, we may find more useful for peaceful, soft, atmospheric, harsh, and evocative, than for beautiful.【29】The least that should be said is that beautiful belongs to a class of terms from that it has been chosen as much for convenience' sake as for any other things.【30】After all, then, how should a philosopher study in order to understand such idea as beauty and taste?

(21)

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第4题

材料：

A block may not only indicate the insertion of new information，but also the omission of matter previously shown．The text of the Notice should invariably be read carefully．The limiting lines of a block are determined for convenience of reproduction．They need not be strictly adhered to when cutting out for pasting on the chart，provided that the preceding paragraph is taken into consideration．Owing to distortion the bocks do not always fit the chart exactly．When pasting a block on a chart，therefore，care should be taken that the more important navigational features fit as closely as possible．This is best done by fitting the block while it is dry and making two or three pencil ticks round the edges for use as fitting marks after the paste is applied to the chart．

问题：

DISTORTION means that ______．

A.the change in form of the block

B.extract of in form of the block

C.the extension in form of the block

D.the increasing of the data in the block

When cutting out and pasting the block care should be used to ensure that ______．A.it be dry enough

B.pencil should be used properly

C.the limits are adhered strictly

D.the more important navigational features fit as closely as possible

The block is not used to ______ ．A.show omissions

B.provide new information

C.make corrections to the Notice

D.change the shape of the charts

The block should be ______ on the chart．A.pasted

B.drawn by pencil

C.fitted

D.put

请帮忙给出每个问题的正确答案和分析，谢谢！

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第5题

Many people dream of having a smarter brain. Princeton neurobiologist Joseph Z. Tsien found the key. In September he announced that he built a better mouse by altering a gene that 【M1】______ affects learning and memory. A similar process of gene manipulation might conceivably be used one day to boost up 【M2】______ intelligence in humans. The secret lies in a feature of brain cells which called the 【M3】______ nomda receptor, which Tsien likes to a cylindrical tube or window 【M4】______ that mediates the flow of information. When the window is open, chemicals called neurotransmitters flow through easily and memory is registered or stored. Tsien noticed that the receptor 【M5】______ worked more efficiently when teamed with the gene NR2B, so he introduced extra NR2B genes into a batch of fertilized mouse eggs. In a normal mouse, the memory window is open in just 【M6】______ 150-thousandths of a second. In Tsiens specifically engineered 【M7】______ mice, the window opens for 250-thousandths of a second, long enough to make a remarkable impression in memory retention. 【M8】______ When he pitted his mice with common mice, they won paws down. 【M9】______ Ordinary mice could recognize a Lego block for 12 hours, but smart mice could remember the block for up to three days. "Thats a profound enhancement," Tsien says. Can it be done with humans? Maybe, so genetic engineering 【M10】______ will have to make some extraordinary advances first. And some thorny ethical issues will have to be resolved. Meanwhile, Tsien promises to keep his furry little geniuses locked up in a lab, far from your larder. "Otherwise," he says, "you might need a smart cat or a smart mousetrap to catch them."

【M1】

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