题目内容
Jack and Kate came back 2 hours ago. But _________ students in the class aren’t here.
A.the other B.others C.another D.the others
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: Some clean iron nails (铁钉) ; test tubes(试管); 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. | (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. Conculsion 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. (238 words) | |
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. | |
1.In the first part of the experiment the cotton wool is most probably used to ____.
A. keep the air dry B. keep the tube wet
C. make the nails rust D. keep the tube clean
2.What are necessary steps to make sure the water in the tube is air-free?
① Leave half a tube of water in it.
② Boil the water for some time.
③ Put some clean iron nails in the tube.
④ Add some oil to the water.
A. ①② B. ①③ C. ②③ D. ②④
3.We can conclude from the experiment that only ____ makes iron rusty.
A. dry air B. cotton wool
C. ordinary water D. air-free water
摘录要点：
阅读下面的短文，然后在表格中完成内容摘要，每空不超过三个单词。
Of course you do not want to spend your vacation sick（生病的） in bed . So what can you do to stay in good health when traveling ?
A vacation should be a time for relaxing but very often it is not . You may spend most days walking around places .This can be very tiring . A tired body means a weak（虚弱的） body . And a weak body gets sick easily . So sit down for a few hours in a nice and quiet place if you feel tired .
Sleep is also important .If you want to stay healthy ,you need to get enough sleep .Your hotel room may be noisy or the bed may be uncomfortable . You may want to stay out late at night . Then you should plan to sleep for an hour during the day . That extra（额外的） hour can make a big difference .
At last ,if you want to stay healthy ,you must eat well .That means eating the right kinds of food . Your body needs fresh fruit and vegetables ,and some meat and milk .
Remember ,if you want to enjoy your vacation ,take good care of yourself .
How to stay 1. when traveling | |
Relax | Walking around places for long time can be 2. Stop to relax in a(n) 3. place . |
Sleep enough | You may not get enough sleep for some reasons . Sleep for4. during the day . |
5. | Eat the right kinds of food . |