直接或间接利用绿色植物有机物作为食物源的异养生物是__________。

直接或间接利用绿色植物有机物作为食物源的异养生物是__________。

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Hardly ______ when the door suddenly closed.

Hardly ______ when the door suddenly closed.A. they had arrivedB. they arrivedC. did they arriveD. ha

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诊断慢性腹泻的时间为( )。

诊断慢性腹泻的时间为( )。A.1个月以上B.2个月以上C.3个月以上D.4个月以上E.5个月以上

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吸收眼内散射光线作用的结构是 ( )

吸收眼内散射光线作用的结构是 ( )

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Student A: I wonder whether you are satisfied with the new equipment. Student B:

Student A: I wonder whether you are satisfied with the new equipment.Student B: ______. It gives me a

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