---How often does she have dancing classes?

---_________.

A．On Saturday afternoon

B．At 9 o’clock

C．Once a week

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Simple Scientific Experiment（實(shí)驗(yàn)）

Below is a description of a single scientific experiment. It shows us how iron(鐵) reacts (反應(yīng)) 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.

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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.

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