2012年北师大版高中英语选修八Unit22练习卷

适用年级：高二
试卷号：659751

试卷类型：课时练习
试卷考试时间：2017/8/18

1.选择题(共3题)

1.下列有关实验的说法正确的是（）

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2.下列关于电解池的叙述不正确的是（）

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3.某有机物A用质谱仪测定如图①，核磁共振氢谱示意图如图①，核磁共振氢谱示意图如图②，则A的结构简式可能为（）

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—When do we need to pay the balance?
—________ September 30.

A．In

B．By

C．During

D．Within

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It’s quite ____me why such things have been allowed to happen.

A．for

B．behind

C．against

D．beyond

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The accident is reported to have occurred _____the first Sunday in February.

A．at

B．on

C．in

D．to

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Sorry，madam.You'd better come tomorrow，because it's ________the visiting time now.

A．during	B．at
C．beyond	D．before

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