图1表示北纬50°某地区不同月份母鸡平均产蛋数的波动情况，图2是母鸡繁殖活动的生理调

将“把”字句改为“被”字句。

（1）他把小鱼扔进大海里。

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（2）太阳会把水洼里的水蒸干。

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（3）妹妹把作业写完了。

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住房公积金的本质属性是( )。

A．奖金

B．津贴

C．贷款

D．工资

介词填空

小题1:When you get something wrong，it can shake your belief ________yourself.

小题2:The aim ________education should be to teach students how to think rather than what to think.

小题3:She had her hair cut ________a really nice style on her first day of work.

小题4:I  can’t focus my  attention ________my homework with so much noise going on downstairs.

小题5:________the other hand,  technological advances have created many problems that threaten our human existence.

如果一棵二叉树结点的前序序列是A，B，C，后序序列是C，B，A，则该二叉树结点的对称序序列

A．必为A，B，C

B．必为A，C，B

C．必为B，C，A

D．不能确定

肺痈成痈化脓的病理基础，主要在于

A．痰热壅盛

B．热伤血脉

C．血脉瘀滞

D．热壅血瘀

E．气滞血瘀