正确答案: BC

冰花主要是水蒸气凝华形成的 冰花出现在窗玻璃内侧

题目：天津地区一年四季分明，严冬的早晨在窗玻璃上会出现“冰花"。下列说法正确的是

解析：BC

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举一反三的答案和解析：

[单选题]对于一个处于平衡状态的生态系统来说，下列哪种现象不存在( )

生物个体数量不变

[单选题]（ ）是一种避开强有力的竞争对手的市场定位。其优点是能够迅速在市场上站稳脚跟，并能在消费者或用户心目中迅速树立起一种形象。由于这种定位方式市场风险较少，成功率较高，常常为多数企业所采用。

避强定位

[单选题]—It’s very ________ of you to work out the problem for me. 学科网 —That’s all right.

—It’s very ________ of you to work out the problem for me. —That’s all right.

kind B．clever C．necessary

[单选题]我国有文字可考的历史始于

商朝

[单选题]12．

takes

解析：12.C【解析】构成句型：It takes+time+for sb. /sth. to do sth.意为：做某事花费某人／物多少时间．

[单选题]33．_________is on my desk．

My clock

解析：33.A【解析】根据第二段第二句可得知．

[单选题]BMr Jackson has a happy family． His wife stopped working after they married．They have two children． One is a daughter，Susan，and the other is a son， Bill．Susan works in a famous university and Bill is a good policeman．' They are both married and they have their own fami- lies． And Mr Jackson became the manager of a company． He can get much money every year．But people find the man always look worried this month． And he-s much fatter than be- fore． Sometimes he-s out of breath when he goes up to his office on the second floor．He often complains that he can't sleep well in the night and eels tired． So his friends asked him to go to see a doctor．"Medicine can-t help you， Mr Jackson， the doctor said after he looked him over． "Do more exercise if you want to live longer． ""But what sport can I do?""Playing golf(失球)． It’ll be useful to you． "The man， of course， has to listen to the doctor． He goes to play golf on weekends． He enjoys himself there， but he can-t learn it well．One day the ball dropped on an anthill(蚁丘)． After many swings(挥动球杆） he demol- ished(毁坏) the anthill， but he still couldn't hit the ball． And only two ants were alive． Soone of them said to the other， "We'd better be on the ball if we don-t want to die!"

two children

解析：26.C【解析】从“They have two children”可知，

[单选题]22． We can see ________in the room．

two beds

[单选题]13．I'm going skating． Would you like to go with_________?

me

解析：13.A【解析】with后跟人称代词的宾格。