在国境口岸或者交通工具上发现啮齿动物有反常死亡或者死因不明的，国境口岸有关单位或者交

倾斜型带式输送机的拉紧装置，应采用螺旋式拉紧装置。

简要分析地理环境对开放与封闭的影响。

I often give my mother a _____ when she is busy doing the housework. [ ]

A. seat

B. reply

C. smile

D. hand

阅读理解

     What would you think if I told you I could eat 40 percent more food than other people-eating boxes

of ice cream, bowls of noodles and plates of meat-all while losing weight?

     You might hate me, thinking I have one of those annoyingly good metabolisms(新陈代谢)that just

burn up fat the instant it enters my body. You might wonder if I have an intestinal(肠的)worm, or

perhaps an eating disorder. Or maybe you'd just shrug your shoulders and figure I have a rich fantasy

life.

     You'd be wrong.

     For my body to finish such a surprising task, I would have to be a mouse. Not just any mouse, but

one lucky enough to be involved in a new study at Baylor College of Medicine in Houston.

     After identifying an enzyme(酶)that allows fat to be stored in the body, scientists fed mice without

those enzymes, and found those mice were able to consume far more food than other mice-and still

weigh 10 to 15 percent less.

     Best of all, the mice that had no enzymes were in very good health, producing baby mice with no

problem and generally acting like any other mouse. That's great news for obesity researchers, who think

that scientists may figure out a way to prevent the fat metabolizing(脂肪代谢)enzyme in humans and

control weight gain. And such a pill would be very exciting for many people who are struggling to get rid

of dangerous extra pounds.

     But don't start planning any big dinner just yet. At this point, of course, any pill for humans is but a

twinkle(闪烁) in the eye of every medicine company's CEO. More tests are to be made, and eventually

humans will be introduced in the test.

     But for now, unfortunately, control in diet is still the key.

1. What does "such a surprising task" in Paragraph 4 refer to?

A. Eating a lot of food while losing weight.

B. Burning up fat very quickly.

C. Controlling the diet.

D. Having a rich fantasy life.

2. 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.

3. 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

4. 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.

简述道教与风水