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单选题 I still remember the place ______ I met her for the first time.

单选题 You should have been more patient ______ that customer; I'm sure that selling him the watch was a possibility.

单选题 It's very ______ of you not to talk aloud while the baby is asleep.

单选题 I broke my relationship with Anne because she always found ______.

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单选题 ______, wild dogs have very keen(灵敏的)senses of sight, hearing, and smell.

单选题 Many animals have an excellent sense of smell, which they use in hunting. On the other hand, their eyesight may be poor. Dogs, for example, have poor eyesight and no color vision. They see only shades of gray. But the dog's sense of smell is extraordinary, The kind of dog known as Alsatian has 220 million olfactory (嗅觉) cells. Man has five million. Scientists believe that the Alsatian is one million times better than man in finding out odors. The human sense of smell, however, is really quite good. The average human being can distinguish more than 10,000 different odors.

单选题 Usually there is ______ traffic in the streets on weekdays than on Sundays.

单选题 People need to be active to be healthy. Our modern lifestyle and all the conveniences we've become used to have made us keep a long time sitting, such as sitting around in front of the TV or the computer, riding in the ear for even a short trip to the store and using elevators instead of stairs. That's dangerous for our health. Physical inactivity is as dangerous to our health as smoking! Add up your activities during the day in periods of at least 10 minutes each. Start slowly...and build up. If you're already doing some light activities move up to more moderate ones. A little is good, but more is better if you want to achieve health benefits. Scientists say accumulate 60 minutes of physical activity every day to stay healthy or improve your health. Time needed depends on effort—as you progress to moderate activities, you can cut down to thirty minutes, four days a week. Physical activity doesn't have to be very hard to improve your health. This goal can be reached by building physical activities into your daily routine. Just add up in periods of at least ten minutes each throughout the day. After three months of regular physical activity, you will notice a difference—people often say getting started is the hardest part.

单选题 The pressure ______ causes Americans to be energetic, but it also puts them under a constant emotional strain.

单选题 ______ illness, he went to the seaside for vacation.

单选题 The next few days could be ______ for the peace negotiation.

单选题 Silver is the best conductor of electricity, copper ______ it closely.

单选题 I've worked here since I ______ Harvard Business School.

单选题 In order to learn a foreign language well, it is necessary to overcome the fear of making mistakes. If the primary goal of language use is communication, then mistakes are secondary considerations that may be dealt with gradually as awareness of those mistakes increases. On the other hand, students should not ignore their mistakes. The language learner may observe how native speakers express themselves, and how native expressions differ from the way the learner might say them. For example, a Spanish speaker who has been saying 'I do it' to express willingness to do something in the immediate future, could, by interacting with native speakers of English, observe that native speakers actually say 'I'll do it'. The resulting difference can serve as a basis for the student to modify his way of using the present tense in English. But a student who is unwilling to interact in the first place would lose this opportunity to learn by trial and error.