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His schoolbag _____ his baseball are on the sofa,____ his clock is not.

A.and ,and B.but, but

C. and ,but D. but, and

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Simple Scientific Experiment(實驗)

Below is a description of a single scientific experiment. It shows us how iron(鐵) reacts (反應) with air and with water.

Aim: To find out if iron rusts(生銹) (a) in dry air; (b) in water that has no air in it (air-free water) ; (c) in common water.

Materials: Some clean iron nails(鐵釘) ; test tubes(試管); test tube holder; cotton wool; oil; Bunsen burner.

Iron in dry air

Method

(1) Put some iron nails at the bottom of a test tube.

(2) Push some cotton wool down the tube.

(3) Leave the tube for one week.

Result

After one week, the nails have not rusted.

Conclusion

Iron does not rust in dry air.

(4) Add some oil to the water. (This will keep air out of the water.)

(5) Leave the tube for one week.

Result

The nails do not rust in the tube with air-free water.

Conclusion

Iron does not rust in air-free water.

Iron in ordinary water

Method

(1) Half –fill a test tube with water and add

two or three clean nails.

(2) Leave the tube for one week.

Result

The nails rust in the tube with common water.

Conclusion

Iron rusts in common water.

Iron in air-free water

Method

(1) Half-fill a test tube with water.

(2) Boil the water for three minutes. (This makes sure there is no air in the water.)

(3) Put two or three clean nails in the water.

1.In the first part of the experiment the cotton wool is most probably used to _______.

A. keep the air dry B. keep the tube wet

C. make the nails rust D. keep the tube clean

2. What are necessary steps to make sure the water in the tube is air-free?

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② Boil the water for some time.

③ Put some clean iron nails in the tube.

④ Add some oil to the water.

A. ①② B. ①③ C. ②③ D. ②④

3.We can know from the experiment that only _______ makes iron rusty.

A. dry air B. cotton wool C. common water D. air-free water

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完形填空 (共10小題;每小題1分,滿分10分)

閱讀下面的短文,從文后各題所給的A、B、C、D四個選項中,選擇最佳選項。

Each year, thousands of Chinese middle school students go to study in foreign countries such as the US, the UK, Australia and Japan.

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