单项选择题
Although there are more female students at the college than male students, the women seem to have a ______ influence on the student government.
A.tremendous
B.negligible
C.provocative
D.venerable
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Directions: In this part, you are required to write a composition entitled On Sustainable Development in China in no less than 200 words. Your composition should be based on the following outline: 1. The definition of sustainable development. 2. Your suggestions as to how to achieve sustainable development in China.
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把食物给动物的时候,它会流涎。在给予食物之前不久,如果反复出示铃铛,动物听到铃声就开始流涎,即使不提供食物也是如此。只要铃声伴随着食物的试验反复进行,反应的时间就会减少。这一过程被称为条件反射作用,伴随着铃声的流涎叫做条件反射。如果多次出示铃铛却不让食物紧接着出现,条件反射要么自然而然地产生,要么就会失效。
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