题目内容

是谁创造了“称量法”来鉴别水的好坏:

A. 雍正皇帝
B. 贾宝玉
C. 康熙皇帝
D. 乾隆皇帝

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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）

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