问题 选择题

磁流体是电子材料的新秀,它既具有固体的磁性,又具有液体的流动性,制备时将含等物质的量的FeSO4和Fe2(SO4)3的溶液混合,再滴入稍过量的NaOH溶液,随后加入油酸钠溶液,即可生成黑色的、分散质粒子的直径在5.5-36 nm的磁流体,下列说法中正确的是[ ]

A.所得的分散系属于悬浊液

B.该分散系能产生丁达尔效应

C.所得的分散系中分散质为FeSO4

D.给分散系通直流电时,阳极周围黑色加深

答案

答案:B

完形填空

完成句子(共10小题,满分10分)

根据句意,在空格处填入适当的单词使句意完整,每空只能填一个词,请将该部分答案写在答题纸上。

86. 杂技演员走钢丝时, 观众都屏住了呼吸。

The audience ___________ its/their ____________as the acrobat walked along the tightrope.

87. 我期待暑假见到你。

I’m __________ ___________ to seeing you this summer vacation.   

88. 你会知道她是个信守诺言的女孩。

You’ ll find that she is a girl who always ___________ her ___________.

89. 他们很年轻的时候,就开始谋生了。

They began to___________ their ____________ when they were very young.

90.她说她八点在这等我,但现在九点了,她还没出现。

She told me she would meet me here at 8:00. But it is 9 o’clock now and she still hasn’t _____     ___    __ yet.

91. 考试作弊必予追究。

If you cheat in the exam, you'll never                       with it.

92. 这本词典不久就要出版。

The dictionary will be published _________ _________.

93. 经过长时间的讨价还价,我妻子终于把那件裙子的价钱砍了下来。

After bargaining for a long time, my wife succeeded in       ___________the price of the dress.

94.所有认识他的人都羡慕他取得诺贝尔化学奖。

All those who knew him          him            his winning the Nobel Prize for chemistry.

95.他们都是由那位老人养育成人的。

They were all                     by that old man.

单项选择题