1 . The dirty g________ from cars pollute the air.
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2 . If the temperature is raised high enough, we can turn iron into a state of _________.
A.liquid | B.ball | C.solid | D.gas |
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3 . If the temperature is raised high enough, we can turn iron into a state __________.
A.liquid | B.ball | C.solid | D.gas |
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4 . We need _________ (煤气)for cooking delicious meals.
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5 . Which of the following is a kind of new energy?
A.Coal. | B.Oil. | C.Gas. | D.Wind. |
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6 . When the fire happens, we had better turn off the g________ .
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7 . Without ________, people can’t breathe.
A.oxygen | B.gas | C.water |
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8 . The air is a kind of g________ with no colour and smell.
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9 . Which of the following is new energy?
A.coal | B.oil | C.wind | D.gas |
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