在一定范围内按不同密度播种的三叶草，其最终产量与播种密度无关

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问题单项选择题

在一定范围内按不同密度播种的三叶草，其最终产量与播种密度无关，这是 ( )

A．养分制约的结果

B．空间制约的结果

C．密度制约的结果

D．人为影响的结果

答案

参考答案：C

填空题

用下列词的适当形式填空。

1. He's too old. He can't run _______ (quick).

2. She's very careless. She can't do her lessons _______ (careful).

3. Little Tom is often late for class. His teacher is quite _______ with him. He said to him _______, "Don't be

late again." (angry)

4. It's dark in the room. Can you see these pictures _______ enough (clear)?

5. Listen, the children are playing games _______ (noisy).

6. There was a _______ rain last night. When I got home, it was raining _______ (heavy).

7. Please take _______ care of the little bird. It can sing _______ (good).

8. Walk _______ in the library, you should keep _______ (quiet).

填空题

射频识别技术的基本原理是（）