将培养在培养液中的黄瓜，从光下移至暗处，水分的消耗显著下降，

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问题选择题

将培养在培养液中的黄瓜，从光下移至暗处，水分的消耗显著下降，然而对K⁺的吸收却有所增加，这说明了[ ]

A．根对水分和矿质元素的吸收部位不同

B．根对水分和矿质元素的吸收是两个相对独立的过程

C．蒸腾作用对水分和矿质元素的吸收影响不同

D．根在吸收水分的同时，矿质离子也被吸收

答案

答案：B

选择题

在下列实例中，通过食物链而引起的危害是[ ]

A．大气中的臭氧层出现空洞

B．温室效应

C．汞、DDT等有毒物质的积累

D．酸雨

填空题

动词填空。

1. Look! The police _________ (hunt) for the lost dog in the forest.

2. There _________ (be) a wonderful basketball match this weekend, won't there?

3. If the boy __________ (not be) so lazy, he'll pass the exam.

4.________ (spend) too much time on computer games may do harm. to our eyes.

5. The policeman told the children __________ (not play) football in the street.

6.Do you know how ___________(get) to the supermarket.