题目内容

离子通道不可以让所有离子通过。()

A. 对
B. 错

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机械力能使某些离子通道打开。()

A. 对
B. 错

离子通道的开与关主要是因为细胞膜的流动。()

A. 对
B. 错

研究人在做梦时大脑的变化属于社会科学性质。()

A. 对
B. 错

Please select the three suggestions on how to make friends. ( )

A. Getting involved in extracurricular activities(para. 3)
B. Going out of your room to meet new people and make friends (para.5)
C. Getting in touch with people by Facebook. (para.4)

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