- Why did you stay up last night? You look sleepy now.-I was busy next week’s exam.A. paying for B. looking forC. preparing for 题目和参考答案——青夏教育精英家教网—

题目内容

— Why did you stay up last night? You look sleepy now.

—I was busy ____________ next week’s exam.

A. paying for B. looking for

C. preparing for

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Dogs are known for their sense of smell. They can find missing people and things. Now a study shows that the animal can even find bladder cancer (膀胱癌).

Cancer cells can produce chemicals with unusual smells. Scientists think dogs have the ability to smell these smells, even in very small amounts, in urine (尿).

For example, a dog showed great interest in the growth of its owner’s legs. The man was later found to have skin cancer. Carolyn Willis and some scientists trained different kinds of dogs for the experiment. The study used urine collected from bladder cancer patients (病人), from people with other diseases and from healthy people. Each dog was tested 8 times. In each test there were 7 examples for the dog to smell. The dog should show the one from a bladder cancer patient by lying down next to it.

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2.Why did the writer give the detailed experiment in the third paragraph?

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B. To support the second paragraph.

C. To teach us to do some experiments.

D. To let us know the reason of the experiment.

3.What would the dog do when it found the right urine?

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B. It would take the urine to the scientists.

C. It would lie down next to the urine.

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4.What’s the main idea of the passage?

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5.Who may be most interested in reading the passage?

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In recent years, many children _______ what they are not ___________.

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