下图表示三个通过突触连接的神经元。现于箭头处施加一强刺激,

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问题选择题

下图表示三个通过突触连接的神经元。现于箭头处施加一强刺激, 则能测到动作电位的位置是[ ]

A．a和b处

B．a、b和c处

C．b、c、d和e处

D．a、b、c、d和e处

答案

答案：C

填空题

用画线部分的反义词填空。

1. Is Tom a short or a ____________ boy?

2. There isn't much tea in the bottle. There is ____________ tea in the bottle.

3. Is the bag ____________ or ____________?

4. The desks aren't dirty. They are ____________.

5. This question isn't easy for me. It's too ____________.

6. Do you think she is right or ____________?

7. Is it very hot tomorrow? No, it is very ____________.

8. Do you want a small one? No, I want a ____________ one.

9. Her umbrella is cheap, it's not ____________.

10. The English dictionary is thick. It isn't ____________.

单项选择题

某超市经销甲品牌的电器，产品售价为2000元/台，单位商品变动成本为1500元/台，固定成本分摊为4万元。甲品牌的电器的保本销售量为( )台。

A．80

B．20

C．100

D．27