下列哪种现象不是生物对环境的适应 [ ] A．河边垂柳的树枝

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问题选择题

下列哪种现象不是生物对环境的适应 [ ]

A．河边垂柳的树枝长向河心

B．蚯蚓在土壤里活动，可使土壤疏松

C．秋天大雁南飞越冬

D．荒漠中的骆驼刺有着非常发达的根系

答案

答案：B

单项选择题

MZ1---1000型自动埋弧焊机外特性曲线的形状是（）。

A、缓降

B、陡降

C、平硬

D、上升

填空题

根据汉语提示，用单词的正确形式填空。每空一词。

1. Making a ________ (演讲) in public is a kind of art.

2. Austria is the center of European classical ________ (音乐)

3. Don't go out on rainy and ________ (多风的) days.

4. Everyone else in my class was invited (除) me.

5. There are a lot of old (工厂) in our city.

6. Be (小心) of the dog that does not bark.

7. You have to be 18 years old before you are (允许) to drive a car.