单选题(　　)tired after a hard work, she fell into bed and went straight to sleep.

单选题—Sir, ______? —Yes, sir. You ran through the stop sign. May I see your driver license, please?

单选题When I finished the story, Lenin jumped from his chair and started to pace the floor, ______, deep in thought. A. with his head bending B. his head bending C. his head bent D. bending his head

单选题Today we (have made) (great achievements), but tomorrow we (shall win) still (great victories). A. have made B. great achievements C. shall win D. great victories

单选题I have kept that photo ______ I can see it every day, as it reminds me of my university days in London.

单选题This (equipment) is (based upon) advanced (techniques) and it is (highly reliable).

单选题He abandoned a career that ______ to his becoming one of the most influential people in the world.

单选题You should respect others" opinions, and at the same time you should insist on ______ you believe is right.

单选题After being tested in many Ways, this newly-designed machine will ______in the near future.

单选题Long-distance runners may at times worry about their heart health while taking part in the events. But a study finds that heat stroke (中暑) fells many more runners than 1 a heart problem. Heat stroke can damage a person"s brain, heart, kidneys and 2 . And new data shows the toll it takes. Researchers 3 health records from more than 130,000 runners who competed in long-distance events during a seven-year span. The analysis 4 that distance runners were 10 times more 5 to experience heat stroke than serious heart problems. All the fatal or life-threatening events were 6 heat stroke. The researchers advise runners to take 10 to 14 days to adjust to the climate 7 taking a serious run in a hot region. And they say runners should 8 taking part in the event if they"ve been sick recently. 9 one day runners will be installed some internal temperature controller that can keep their body temperature normal. But for now runners should simply 10 their best to keep cool.

单选题Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest to the antenna (天线). But whether that causes any harm is not clear, scientists at the National Institute of Health said at a conference last month, adding that the study will not likely settle concerns of a link between cell phones and brain cancer. "What we showed is glucose (葡萄糖) metabolism (代谢) (a sign of brain activity) increases in the brain in people who were exposed to a cell phone in the area closest to the antenna," said Dr. Nora Volkow of the NIH, whose study was published in the Journal of the American Medical Association. (76) The study was meant to examine how the brain reacts to electromagnetic fields caused by wireless phone signals. Volkow said she was surprised that the weak electromagnetic radiation (电磁辐射) from cell phones could affect brain activity, but she said the findings do not shed any light on whether cell phones cause cancer. "This study does not in any way indicate that. What the study does is to show the human brain is sensitive to electromagnetic radiation from cell phone exposures." Use of the devices has increased dramatically since they were introduced in the early 1980s, with about 5 billion cell phones now in use worldwide. Some studies have linked cell phone exposure to an increased risk of brain cancers, but a large study by the World Health Organization did not offer a clear answer to this. Volkow's team studied 47 people who had their brain examined while a cell phone was turned on for 50 minutes and another while the phone was turned off. While there was no complete change in brain metabolism, they found a 7 percent increase in brain metabolism in the region closest to the cell phone antenna when the phone was on. (77) Experts said the results were interesting, but urged that they be understood with great care. " Although the biological significance, if any, of increased glucose metabolism from too much cell phone exposure is unknown, the results require further investigation," Henry Lai of the University of Washington in the U.S. and Dr. Lennart Hardell of University Hospital in Sweden, wrote in an article in JAMA. "Much has to be done to further investigate and understand these effects." They wrote.

单选题Young ______ he is, he knows what is the fight thing to do.

单选题No sooner (had) Professor Smith (begun) to speak (when) some noise (arose) from the audience.

单选题Tom and I (are) looking forward to (be seeing) you, (so) don't (disappoint) us !

单选题He will do everything that is __________me.

单选题The idea ______ to him in his dream and he decided to carry it out.

单选题I didn't mind their coming late to the lecture, but I objected their making so much noise.