28．The Changbaishan Mountains have a hug

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问题选择题

28．The Changbaishan Mountains have a huge variety of scenery, some of the best of__________can only be reached on foot.

A．that

B．which

C．what

D．Where

答案

答案：B

补全对话，情景问答

根据对话内容,在空白处填写适当的话语。

Dora: Do Chinese keep animals for pets?

Li Dan: Not as __1__ as people in the USA.

Dora: What animals do they usually keep?

Li Dan: They usually keep dogs, cats, birds, fish and so on.

Dora: __2__ do you keep?

Li Dan: I don't keep any animals as a pet.

Dora: __3__?

Li Dan: To keep a pet takes time and costs money.

Dora: Yes, that's true. If you keep a pet, you need to spend some time __4__ it, like

walking it, feeding it and cleaning it. When it gets sick, you need to send it to hospital.

Li Dan: I don't keep pets because I think pets often make our rooms dirty and smelly. If I keep a

pet, I prefer to keep fish because they are clean.

Dora: __5__.

单项选择题

PN结在正向电压的作用下（）。

A.结电阻减小，电流减小

B.结电阻减小，电流增大

C.结电阻增大，电流增大

D.结电阻很大，只有很小漏电流