He inspected the car before he bought it.

He inspected the car before he bought it. A.invested B.managed C.maintained D.ex

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信息要认真进行()才能适用。

信息要认真进行()才能适用。A.混合 B.筛选 C.搅拌 D.组合

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I thought it would rain,but the clouds have vanished and it'

I thought it would rain,but the clouds have vanished and it's a fine clay. A.dev

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Why do researchers develop a new device to monitor signs of

Why do researchers develop a new device to monitor signs of landslides?A.because

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He presented a new approach.

He presented a new approach. A.triumph B.movement C.response D.method

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