题目内容

I wanted to know when and where we should ________our assignments.

A. set back
B. fall into
C. hand in

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We considered ________to California at first, but decided not to in the end.

A. move
B. moving
C. to move

Australia has its own ________identity, which is very different from that of Britain.

A. busy
B. central
C. cultural

1．下列关于萜类挥发性的错误论述是（）。

A. 所有费苷类单萜及倍半萜具挥发性
B. 所有单萜苷及倍半萜苷不具挥发性
C. 所有非苷类二萜不具挥发性
D. 所有二萜苷不具挥发性
E. 所有三萜不具挥发性

2．从中药中提取二萜类内酯可用的方法是（）。

A. 水提取醇沉淀法
B. 酸水加热提取加碱沉淀法
C. 碱水加热提取加酸沉淀法
D. 水蒸汽蒸馏法
E. 升华法