蟋蟀的发育要经过的几个阶段是（） A．受精卵、幼虫、成虫

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问题选择题

蟋蟀的发育要经过的几个阶段是（　　）

A．受精卵、幼虫、成虫

B．受精卵、幼虫、蛹、成虫

C．受精卵、蛹、幼虫、成虫

D．受精卵、蛹、成虫

答案

蟋蟀的发育包括受精卵、幼虫、成虫三个时期为不完全变态发育．

故选A．

填空题

单词拼写。

1. To the ______ (满意) of my parents, I was admitted into a university in Jiangsu.

2. Don't blame him. It was not his f______ after all.

3. I think this is a complex problem, so we need an expert to h______ it.

4. The job as a teacher calls for wide knowledge and p______.

5. Fishing is ______ (禁止) in the lake at this time of year.

6. You never look tired. What's your secret of keeping e______?

7. He is much better, but has not fully r______ from his liver failure.

8. She is such an ______ (有吸引力的) girl that she is always the focus.

9. Harry is ______ (惭愧的) of having lied to Sally.

10. The police haven't ruled out the p______ that Justin was taken away by the aliens.

填空题

若a=3^x，b=2^y-2x，c=3^y，d=2^x+y，且有ac=81，bd=32，求（xy）^y-x=（）。