Experts think we won’t have clean water to drink unless something　　 soon,but much remains　　 about environment protection.

A、would be done;doing　　 B、is done;to be done　　

C、will be done;to do　　 D、is done;to do

----- _______ school were you at last year? ----- Centre School.

　 A. What 　 B. Which

　 C. That 　 D. Where

Now Robert, a football fan in our class, _____ rome of his daily allowance given by his parents in order to buy a new football.

　　A.is giving away 　　　　　　B.is throwing away

　　C.is putting away 　　　　　 D.is taking away

―She was so upset that she burst into tears.（ ）

―I’d rather you _______ her all about it.

A. didn’t tell　　　 B. hadn’t told　　 C. don’t tell　　 D. was; be discussed

Children need friends _______ their own age to play with.

A.of　　　 　　　 B.for　　 　　　 C.in　　　　 　　 D.at

Yao Ming is a very strong and e________ basketball player.

It ____ have been Tom that parked the car here, as he is the only one with a car.

A. may　 B. can C. must　 D. should

If we can _____ our present difficulties, then everything should be all right.

　　A. get off 　　 B. come across 　　 C. come over　 D. get over

Equipped with modern facilities,today’s libraries differ greatly from　　　 .

A.those of the past　　 B.the past　　　　　　 C.which of the past　 D.ones of the past

None of our early ancestors could digest milk as adults because their bodies never had to ----milk drinking simply wasn’t an option. As people began to extract milk from animals, though, some people developed the ability to keep drinking it throughout their lives.

　　 Scientists now know of a milk-related mutation ( 变异) in our genes -- the chemical instructions for life that we carry in almost every cell in our bodies. People who have a mutated form of one particular gene can drink milk just fine. People without the mutation tend to get sick from milk.

　　 To figure out where, and possibly why, milk drinking started, some scientists have been looking at who has the milk-digesting mutation today. Patterns are striking.

　　 Most adults in Northern and Central Europe are able to digest milk -- and they do. Cheese and butter and other dairy products are popular in countries such as Sweden, Denmark, Germany and England. Because European settlers dominated North America, most people here can handle milk just fine, as well. That may explain why ice cream is such a popular dessert in the United States.

　　 In much of Africa, Asia and South America, on the other hand, people tend to avoid dairy products because they lead to diarrhea (腹泻) and other stomach problems. (That’s why you won’t typically find cheese on the menu at a Chinese, Japanese or Ethiopian restaurant.) Native

Americans are also unable to digest milk.

　　 Based on these genetic patterns, scientists have long thought that- milk drinking started inNorthern Europe, where dairy is an institution and the milk-digesting mutation is everywhere.

　　 A recent study painted a different picture. With a computer medal, Thomas and colleagues looked at the spread of the milk-drinking mutation, farming and other related factor. Working backward, the scientists concluded that the first milk-thinkers lived in Central Europe around what’s now Hungary about 7,500 years ago. The practice didn't start farther north, as scientists had thought before.

1. Which of the following is the proper order of events according to the passage?

　a. Their children were able to digest milk as adults.

　 b. They got sick from the milk.

　 c. Some people got a mutation in their genes.

　 d. Some people tried drinking milk from animals.

　 e. Some people started to drink milk from animals on a regular basis.

　 A. c→d→b→e→a　 B. d→e→b→c→a C. d →b→e→c→a　 D. e→d→b→c→a

2. Most people in the USA can digest milk because __________.

　 A. they have strong stomachs　　　　　　 B. their ancestors were Europeans

　 C. that’s where milk drinking stinted　　 　D. farmers raise a lot of cows there

3. Which of the following is LEAST likely to appear on the menu in a Japanese restaurant?

A. Butter.　　　　 B. Vinegar.　　　　 C. Fish.　　　　　　　 D. Beef.

4. Which of the following is the author most likely to agree with?

A. Milk drinking first started in Northern Europe.

B. Milk drinking first started in Central Europe.

C. North American Indians were able to digest milk.

D. Dairy products are very popular in North Korea.

5. The main focus of the scientists' research was ______________.

　 A. mutation of human genes　　　　　　　 B. development of the human stomach

C. why milk drinking started　　　　　　 D. where milk drinking first started