The students in China have a holiday every summer．( )A．two monthB．two-monthsC．two month'sD．two-month 题目和参考答案——青夏教育精英家教网——

题目内容

13．The students in China have a _____ holiday every summer．（　　）

A．

two month

B．

two-months

C．

two month's

D．

two-month

分析每年夏天在中国学生们都会有两个月的假期．

解答答案：D．
根据The students in China have a _____ holiday every summer，可知本句考查了复合形容词的用法，这里用复合形容词修饰名词holiday．连字符号连接数词、名词和形容词，用作形容词，这时的名词不用复数形式．结合选项可知应选D．故选D．

点评本题考查指导学生了解two-month用做形容词时，加短线用单数，并且后面必须有名词．

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3．A Simple Scientific Experiment

Below is a description of a single scientific experiment．It shows us how iron reacts （反应） with air and with water．
Aim：To find out if iron rusts（生锈）（a） in dry air；（b） in water that has no air in it （ air-free water）；（c） in ordinary water．
Materials：3clean iron nails （铁钉）； test tubes； test tube holder； cotton wool； oil； Bunsen burner．

Iron in dry air
Method
（1）Put some iron nails at the bottom of a test tube．
（2）Push some cotton wool down the tube．
（3）Leave the tube for one week．
Result
After one week，the nails have not rusted．
Conclusion
Iron does not rust in dry air．
Iron in air-free water
Method
（1）Half-fill a test tube with water．
（2）Boil the water for three minutes．（ This makes sure there is no air in the water．
（3）Put two or three clean nails in the water．

（4）Add some oil to the water．（ This will keep air out of the water．）
（5）Leave the tube for one week．
Result
The nails do not rust in the tube with air-free water．
Conclusion
Iron does not rust in air-free water．
Iron in ordinary water
Method
（1）Half-fill a test tube with water and add two or three clean nails．
（2）Leave the tube for one week．
Result
The nails rust in the tube with ordinary water．
Conclusion
Iron rusts in ordinary water．（238words）

35．In the first part of the experiment the cotton wool is most probably used toA．
A．keep the air dry                            B．keep the tube wet
C．make the nails rust                          D．keep the tube clean
36．What are necessary steps to make sure the water in the tube is air free？D
①Leave half a tube of water in it                ②Boil the water for some time
③Put some clean iron nails in the tube            ④Add some oil to the water
A．①②B．①③C．②③D．②④
37．We can conclude from the experiment that onlyC makes iron rusty．
A．dry air        B．cotton wool      C．ordinary water     D．air-free water．

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