----________ do you have a sports meeting?

---Twice a year.

A.How many B.How long C.How often D.How much

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

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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

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

(5) Leave the tube for one week.

Result

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Conculsion

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Method

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

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Result

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Conclusion

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