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问题 单项选择题

药物中重金属检查是在规定pH条件下与硫代乙酰胺作用显色，该条件为

A．pH=2.5
B．pH=3.5
C．pH=4.0
D．pH=4.5
E．pH=5.0

答案

参考答案：B

选择题

I’m sorry, but I didn’t mean to keep you _____ here for a long time. Can you forgive me?

A．wait

B．waiting

C．to wait

D．waited
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阅读理解

阅读理解。

     To help you decide what might make a good pet, we've put together a pet checklist. We've named some

of the animals that are often kept as pets. We've shown some good points and bad points about each. And

we hope it may help you make the best choice (选择). 

                 

1. You are ______ to keep a raccoon as a pet in many places of America.

A. suggested

B. encouraged

C. not allowed

2. It would be easier for you to keep a ______ as a pet if you're often too busy to take care of it.

A. rabbit or raccoon

B. rabbit or cat

C. raccoon or dog

3. If you feed birds at home, you should be very careful to choose a ______ as your another pet.

A. rabbit

B. raccoon

C. cat

4. The dog may ______ you if you make it angry.

A. hurt

B. fix

C. train

5. The writer tries to help us ______with the checklist.

A. learn how to look after our pets

B. find which animal is our best choice as a pet

C. know what kind of animals can be kept as a pet

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