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问题 多项选择题

下列物质较难通过血脑屏障的是()

A．蛋白质

B．脂溶性物质

C．水和气体

D．大分子及带负电荷较多的水溶性物质

E．低脂溶性分子

答案

参考答案：A, C

计算题

计算12+22+32+…+102，并将结果保留2个有效数字。
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填空题
辨析填空。
demand / request / require
1. This job _____ you to be very careful and quick thinking.
2. They _____ of me to go there with them.
3. All that I _____ of you is that you should be early.
influence / effect
4. The contract will come into _____ as soon as it is signed.
5. A teacher has great _____ over his students.
6. A word from the teacher will have a great _____ on my son.
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