According to a survey, which was based on the responses of over 188,000 students, today's

ess productive and more prone【B1】making mistakes. It is actually caused by【B2】of your "body clock"—a small cluster of brain cells that controls the timing of biological【B3】. The body clock is designed for a【B4】rhythm of daylight and darkness, so that it is thrown out of balance when it【B5】daylight and darkness at the "wrong" times in a new time zone. The【B6】of jetlag persist for days【B7】the internal body clock slowly adjusts to the new time zone.

Now a new anti-jetlag system is【B8】that is based on proven【B9】pioneering scientific research. Dr. Martin Mooreede had【B10】a practical strategy to adjust the body clock much sooner to the new time zone through controlled exposure to bright light.

【B1】

A．from

B．of

C．for

D．to

What is the most important lesson of the WTC collapse?

A．We should wear seat belts while driving.

B．We should build low buildings just as we should drive slowly.

C．We should make building tall buildings illegal.

D．We should pay for safety while constructing tall buildings.

Rebecca: ______

Dora: Really? Well, personally, I think he wears the wrong colors. Actually light colors don't really suit him.

A．I don't think Bob has chosen the right suit.

B．I love the way Bob dresses. He always looks so smart.

C．How funny Bob looks in that jacket!

D．Bob's new coat looks very expensiv

Waiter: Welcome, sir. May I help you? Customer: ______

A．Thank you. I'll have fried tofu and stir-fried cauliflower.

B．Yes, please. I'd like a hamburger and a chocolate shake.

C．Sorry. I don't need your help, thank you.

D．If you want to help me, I'll be glad to accept it.

please, for sixty dollars.

A．Do you want it guaranteed

B．Do you want it insured

C．Do you want it preserved

D．Do you want it ensured

any lives. They can be extremely dangerous, and too often people underestimate their fury.

Hurricanes normally originate as a small area of thunderstorms over the Atlantic Ocean west of the Cape Verde Islands during August or September. For several days, the area of the storm increases and the air pressure falls slowly. A center of low pressure forms, and winds begin to whirl around it. It is blown westward, increasing in size and strength.

Hurricane hunters then fly out to the storm in order to determine its size and intensity and to track its direction. They drop instruments for recording temperature, air pressure, and humidity(湿度), into the storm. They also look at the size of waves on the ocean, the clouds, and the eye of the storm. The eye is a region of relative calm and clear skies in the center of the hurricane. People often lose their lives by leaving shelter when the eye has arrived, only to be caught in tremendous winds again when the eye has passed.

Once the forecasters have determined that it is likely the hurricane will reach shore, they issue a hurricane watch for a large, general area that may be in the path of the storm. Later, when the probable point of landfall is clearer, they will issue a hurricane warning for a somewhat more limited area. People in these areas are wise to stock up on nonperishable foods, flash light and radio batteries, candles, and other items they may need if electricity and water are not available after the stoma. They should also try to hurricane-proof their houses by bringing in light-weight furniture and other items from outside and covering windows. People living in low-lying areas are wise to evacuate their houses because of the storm surge, which is a large rush of water that may come ashore with the storm. Hurricanes generally lose power slowly while traveling over land, but many move out to sea, gather up force again, and return to land. As they move toward the north, they generally lose their identity as hurricanes.

The eye of the hurricane is______.

A．the powerful center of the storm

B．the part that determines its direction

C．the relatively calm center of the storm

D．the center of low pressure

Customer:______. Saleswoman: Yes, they are on the third floor.

A．Excuse me. Do you sell bathing suits?

B．Excuse me. Where are your cosmetics, please.

C．Hello. How can I find Emergency Room?

D．Miss, is this Holiday Inn?

dollars and seventy-five cents. Passenger: Here is four dollars.

A．Don't give me the rest

B．It's not necessary to give me the coins

C．Keep the change

D．I give up the pocket money

The main attraction of training mature elephants is ______.

A．early financial returns

B．their willingness to obey their trainers

C．the avoidance of anxiety in the elephant

D．that elephants are difficult to keep

Samuel: Hey, ______?

Diana: I wish I could. But I really have to stay in and finish my paper tonight.

Samuel: Oh, maybe some other time, then.

A．can I come to visit you tonight

B．shall we have a barbecue some day this week

C．would you like to go to cinema with me tonight

D．John will leave Chicago tonight. Shall we go to see him off