根据同位素年龄测定，经历时间最长的地质时期是__________。A．_爱下问搜题

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问题单项选择题

根据同位素年龄测定，经历时间最长的地质时期是__________。

A．元古代

B．古生代

C．中生代

D．新生代

答案

参考答案：A

填空题

从下面所给出的词汇中选出恰当的词汇,用正确的形式填空,其中有2个多余的词汇.

effect, impress, transform, unique, emphasize feature,
ruin, mercy, ancestor, persuade, ban, solution

1. There are no simple _______to the problem of overpopulation(人口过剩).
2. The report ______the importance of improving safety standards.
3. He _________his daughter to change her mind.
4. Parents worry about the _______________of music on their adolescent's behavior.
5. An earthquake left the whole town in ___________.
6. What _________him most was their speed.
7. Smoking __________in the building.
8. Success and wealth _________ his character.
9. An important _____________ of Van Gogh's paintings is their bright colors.
10. Lions and house cats evolved (进化)from a common ____________.

判断题

泵站吸水管路的流速小于泵进口处流速。