单选题These examples show that openness and the ability to change brings couples a giant step closer to the marital harmony they ______. A. request B. negotiate C. crave D. detest

单选题For 150 years scientists have tried to determine the solar constant, the amount of solar constant energy that reaches the Earth. Yet, even in the most cloud-free regions of the planet, the solar constant cannot be measured precisely. Gas molecules and dust particles in the atmosphere absorb and scatter sunlight and prevent some wavelengths of the light from ever reaching the ground. With the advent of satellites, however, scientists have finally been able to measure the Sun's output without being impeded by the Earth's atmosphere. Solar Max, a satellite from the National Aeronautics and Space Administration(NASA), has been measuring the Sun's output since February 1980. Although a malfunction in the satellite's control system limited its observation for a few years, the satellite was repaired in orbit by astronauts from the space shuttle in 1984. Max's observations indicate that the solar constant is not really constant after all. The satellite's instruments have detected frequent, small variations in the Sun's energy output, generally amounting to no more than 0. 05 percent of the Sun's mean energy output and lasting from a few days to a few weeks. Scientists believe these fluctuations coincide with the appearance and disappearance of large groups of sunspots on the Sun's disk. Sunspots are relatively dark regions on the Sun's surface that have strong magnetic fields and a temperature about 2, 000 degrees Fahrenheit cooler than the rest of the Sun's surface. Particularly large fluctuations in the solar constant have coincided with sightings of large sunspot groups. In 1980, for example, Solar Max's instruments registered 0. 3 percent drop in the solar energy reaching the Earth. At that time a sunspot group covered about 0. 6 percent of the solar disk, an area 20 times larger than the Earth's surface. Long-term variations in the solar constant are more difficult to determine. Although Solar Max's data have indicated a slow and steady decline in the Sun's output, some scientists have thought that the satellite's aging detectors might have become less sensitive over the years, thus falsely indicating a drop in the solar constant. This possibility was dismissed, however, by comparing Solar Max's observations with data from a similar instrument operating on NASA's Nimbus 7 weather satellite since 1978.

单选题Ted ______ to dip into his pocket for his son"s college tuition fees.

单选题Some customs travel well. Often, however, behavior that is considered the epitome of at home is perceived as impossibily rude or, at the least, harmlessly bizarre abroad.

单选题 Individual lines of the poem were very beautiful, but I didn't see how the lines fit together. To me, the poem wasn't ______.

单选题Modem technology has brought ______ communication between people far apart.

单选题 When it is used

单选题 Directions: For this part, you are allowed 30 minutes to write on the topic EQ (Emotional Quotient). You should write at least 120 words but no more than 180 words.

单选题In no country ______ Britain can one experience four seasons in the course of a single day.

单选题A: Fine day, isn't it? B: Well, yeah, it's beautiful. A: ______. B: Yes, I'm extremely well.

单选题He likes to swim ______. A. and playing football B. and he also likes playing football C. and to play football D. and he likes to play football

单选题We're making good progress,（）we've sill got a long way to go.

单选题When the little girl awoke, she found herself _______ by a group of soldiers.

单选题The thief tried to open the locked door but ______. A. in no way B. in vain C. without effect D. at a loss

单选题What does "that" (Par. 1, sentence 6) refer to?

单选题______ is the center of our planetary system was a difficult concept to grasp in the Middle Ages. A. It is the sun and not the earth B. Being the sun and not the earth C. The sun and not the earth D. That the sun and not the earth

单选题I expect they ______ new energy source to replace petrol by 2020. A. will find B. are going to find C. will be finding D. will have found

单选题When the man told them the times of meals at the hotel, Mrs. Smith felt ______.