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问题 单项选择题

空气—乙炔是原子吸收分析法中最常用的一种火焰。通常根据不同的分析要求，则助燃比不同，若为贫燃性气体—乙炔火焰，选择不同特性的火焰。请选择（）

A.燃助比为1：4

B.燃助比为1：2

C.燃助比为1：3

D.燃助比为1：5

答案

参考答案：B

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词汇运用（10分）

小题1:People in the UK eat with ________(knife) and forks.

小题2:My home is far away from the theatre, but _________ are near it.  (they)

小题3:If you take more exercise, you will feel ________(well).

小题4:–Where is your father?

—He is helping Bruce fix his ________(break) bike.

小题5:Is it 20 _________ (minute) walk from your home to the station?

小题6:Tomorrow is my mother's_______（四十）birthday.

小题7:My new house is about 150_______ (平方）metres.

小题8:These _______（参观者）hometown is big and beautiful.

小题9:There are more than two _________ (千)students in our school.

小题10:Thank you for ___________ me to your party tonight. (邀请).
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单项选择题

CDC试验作HLA血清学分型所用的补体为()

A．豚鼠血清

B．马血清

C．兔血清

D．人血清

E．鸡血清
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