植物细胞对矿质离子的吸收之所以具有选择性，与下列哪一项有关（

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问题单项选择题

植物细胞对矿质离子的吸收之所以具有选择性，与下列哪一项有关（）

A.外界环境中离子的浓度

B.植物细胞中细胞液的浓度

C.植物细胞中液泡的大小

D.细胞膜上载体蛋白的种类与数量

答案

参考答案：D

单项选择题

Windows 98的注册表有6个根键，其中用来记录有关的即插即用信息、相关的VxD设置信息以及当作VxD的数据区的根键是______。

A．HKEY_CURRENT_USER

B．HKEY_LOCAL_MACHINE

C．HKEY_CURRENT_CONFIG

D．HKEY_DYN_DATA

句型转换

句型转换，不改变原意。

1. This hotel is the best of all in the city. (不改变原意)

This hotel is better __ hotel in the city.

2. Playing the piano is not easy to learn. (不改变原意)

__ is not easy _ playing the piano.

3. Zhou Qiang doesn't run as fast as I do. (不改变原意)

Zhou Qiang runs _ __ _I do.

4. The boy doesn't do as well as the girl. (不改变原意)

The boy does _ _ _the girl.

5. All the runners start to run as soon as they hear the gun. (不改变原意)

All the runners start to run_____ _____ _____.