C．Controlling the diet.

　　D．Having a rich fantasy life.

　　17．Why did the author say he/she had to be a mouse in Paragraph 4?

　　A．Because a mouse can lose weight no matter how much it eats.

　　B．Because the weight losing tests were made on the mouse.

　　C．Because the mouse has a very good metabolism.

　　D．Because the author wants to try the food without the enzyme.

　　18．In the experiment, the mice without those enzymes

　　________.

　　A．were in good condition

　　B．put on weight

　　C．became weak

　　D．could not have baby mice

　　19．What does the author want to show through the last two paragraphs?

　　A．You can be free of guilt when having big dinners.

　　B．Scientists cannot find the key to identifying the

　　enzyme.

　　C．Don't overeat before the test is made on humans.

　　D．It is unnecessary to control weight at present.

　　B

　　These fast food restaurants constantly remind us of the American fondness with hamburgers，chips and pizza.But America's reputation as the home of fast food is under threat from the British，according to a research carried out by the BBC in 13 nations among 9,000 people.

　　Despite fears over obesity，the study found the British are more obsessed with junk food than any other nation.

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