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问题 选择题

多项式x3-3x2y+4x3y2+5y3是（　　）

A．按字母x的升幂排列

B．按字母x的降幂排列

C．按字母y的升幂排列

D．按字母y的降幂排列

答案

多项式x3-3x2y+4x3y2+5y3是按字母y的升幂排列．

故选：C．

填空题

根据括号中所给的提示写出单词,使句子的意思完整正确。

1. I am learning how to cook _________(with a pleasant taste) meals.

2. There are twelve _______(猴子) in this small zoo.

3. There are many kinds of different _______________(语言) in the world.

4. ____________(幸运), I wasn't hurt badly.

5. Wendy gives me some good ___________(建议) when I have difficulty in learning English.
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问答题 简答题

举例说明生物氧化中CO2的生成方式。
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