题目内容

A.AsB.UnlessC.OrD.But

As
B. Unless
C. Or
D. But

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A.mustB.manyC.oughtD.can

A. must
B. many
C. ought
D. can

A.tooB.neitherC.eitherD.nor

A. too
B. neither
C. either
D. nor

生产者和分解者都是生态系统不可缺少的成分。()

A. 正确
B. 错误

A.getB.takeC.oweD.expect

A. get
B. take
C. owe
D. expect

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