题目内容

培养基按物理状态可分为培养基、培养基和培养基。（提示：液体；固体；半固体）

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课堂讲解布置作业1和2

For traders, it’s an ______ thing to make offers.

A. annoying
B. annoyed
C. annoy
D. annoied

All things are difficult _______ they are easy.

A. behind
B. before
C. after
D. in front

We should first _____ our appreciation for the enquiry.

A. say
B. tell
C. express
D. speak