Do you like drinking Coke? As a symbol of American culture, Coca-Cola is liked by many people, especially young people all around the world. But from now on, perhaps it will be hard for students in the US to get it on campus. A new agreement will end almost all sales of high-sugar fizzy drinks in US schools. The agreement allows only unsweetened juice, low-fat milk and water in primary and middle school vending machines（自动售货机）and cafeterias. Former American president Bill Clinton helped the American Heart Association and the beverage industry（饮料业） to come up with the agreement. He suffered from a weight problem and has had a heart operation since leaving the White House. He takes the agreement as “a bold step forward in the struggle to help 35 million young people lead healthier lives”.
Rising childhood obesity（肥胖）has become a big problem in America. A federal report noted that obesity has tripled among teenagers in the past 25 years. It called for new limits on the marketing of junk food to children. Soda is a particular target because of its caloric content and popularity among children.
Britain has already taken similar steps to fight obesity. A recent study shows that people in the UK are much healthier than the people in the US. However, it’s better late than never. Now American schools are trying to make new rules to guide the students to choose healthy drinks. American schools say goodbye to Coca-Cola.
【小题1】What kind of beverage is NOT allowed to sell on campus?

Do you like drinking Coke? As a symbol of American culture, Coca-Cola is liked by many people, especially young people all around the world. But from now on, perhaps it will be hard for students in the US to get it on campus. A new agreement will end almost all sales of high-sugar fizzy drinks in US schools. The agreement allows only unsweetened juice, low-fat milk and water in primary and middle school vending machines（自动售货机）and cafeterias. Former American president Bill Clinton helped the American Heart Association and the beverage industry（饮料业） to come up with the agreement. He suffered from a weight problem and has had a heart operation since leaving the White House. He takes the agreement as “a bold step forward in the struggle to help 35 million young people lead healthier lives”.

Rising childhood obesity（肥胖）has become a big problem in America. A federal report noted that obesity has tripled among teenagers in the past 25 years. It called for new limits on the marketing of junk food to children. Soda is a particular target because of its caloric content and popularity among children.

Britain has already taken similar steps to fight obesity. A recent study shows that people in the UK are much healthier than the people in the US. However, it’s better late than never. Now American schools are trying to make new rules to guide the students to choose healthy drinks. American schools say goodbye to Coca-Cola.

1.What kind of beverage is NOT allowed to sell on campus?

2.What does the underlined word “tripled” in the second paragraph mean?

3.What is the writer’s attitude（态度）towards limits on junk food?

4.Which of the following statements is WRONG?

5.Which is the best title of the passage?

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 : 3 clean 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. (238 words)

1. 1.

   In the first part of the experiment the cotton wool is most probably used to ______________.

   1. A.
      keep the air dry
   2. B.
      keep the tube wet
   3. C.
      make the nails rust
   4. D.
      keep the tube clean
2. 2.

   What are necessary steps to make sure the water in the tube is air free?
   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

   1. A.
      ①②
   2. B.
      ①③
   3. C.
      ②③
   4. D.
      ②④
3. 3.

   We can conclude from the experiment that only ____________ makes iron rusty.

   1. A.
      dry air
   2. B.
      cotton wool
   3. C.
      ordinary water
   4. D.
      air-free water