单选题It is essential that the temperature (is not) elevated (to a point) where the substance formed (may become) unstable and decompose into (its) constituent(组成的) elements.

单选题Husband: Shall I get something for dinner tonight, dear? I may drop over at the super-market on my way back home.Wife: Oh, yes. I appreciate it. ______

单选题Doctor: ______ Patient: I've caught a bad cold and got a sore throat. A. Do you have anything to declare, sir? B. Good morning. May I help you? C. How have you been getting along recently? D. What seems to be the problem?

单选题Woman: I'm new in town. Can you tell me how to get to the Subway?Man: Turn left around the coner and then walk one block up. ______.

单选题His parents out ______ this evening. A. all are B. are all C. both are D. are both

单选题Jim: I have a pair of tickets for an opera Saturday night. Would you like to go?Cindy: I don't think so.

单选题Ernest Hemingway wrote a short story called "The Capital of the World." In it he tells about a Spanish father who wants to reconcile (和解) with his son who has run away to Madrid. In order to locate the boy he takes out this ad in the newspaper: "Paco, meet me at Hotel Montana at noon on Tuesday. All is forgiven. Love, Papa." Paco is a common name in Spain, and when the father goes to the square he finds 800 young men named Paco waiting for their fathers. What drew them to the hotel? As Hemingway tells it, it was the words "All is forgiven." The father did not say, "All WILL BE forgiven IF you do this or that." Not, "All WILL BE forgiven WHEN you do such and such." He simply says, "All is forgiven." No strings attached. And that"s the hard part—unattaching the strings. The origin of the expression "no strings attached" may go back to ancient times when documents were written on parchment (羊皮卷) that were rolled up and secured with a string. The Babylonian Talmud (犹太法典) tells of a man who gives his wife a hill of divorce on such a parchment, but holds onto the string so that he can snatch it back, should he choose to do so. The divorce, therefore, is not considered valid since he will not give it freely. Similarly, love, forgiveness or friendship that is given with strings attached are not valid, since they can be snatched back at any time.

单选题Fifty volunteers were alphabetically divided into two equal groups, Group A to participate in a 7 weeks exercise program, and Group B to avoid deliberate exercise of any sort during those 7 weeks. On the day before the exercise program began, all 50 men participated in a step-test. This consisted of stepping up and down on a 16-inch bench at 30 steps a minute for 5 minutes. One minute after completion of the step-test, the pulse rate of each subject was taken and recorded. This served as the pretest for the experiment. For the next 7 weeks, subjects in the experimental group (Group A) rode an Exercycle (a motor-driven bicycle-type exercise machine) for 15 minutes each day. The exercise schedule called for riders to ride relaxed during the first day"s ride, merely holding on to the handle bars and foot pedals as the machine moved. Then, for the next 3 days, they rode relaxed for 50 seconds of each minute, and pushed, pulled, and pedaled actively for 10 seconds of each minute. The ratio of active riding was increased every few days, so that by the third week it was half of each minute, and by the seventh week the riders were performing 15 solid minutes of active riding. At the end of the 7 weeks, the step-test was again given to both groups of subjects, and their pulses taker, The post-exercise pulse rates of subjects in the experimental group were found to have decreased an average of 30 heart beats per minute, with the lowest decrease 28 and the highest decrease 46. The pulse rates of subjects in the control group remained the same or changed no more than 4 beats, with an average difference between the initial and final tests of zero.

单选题(After) the (development) (of) the steam engine by James Watt in the late 1700s, the Industrial Revolution progressed (forward) rapidly.A. AfterB. developmentC. ofD. forward

单选题What did you put in your suitcase? It's almost ______ mine. A. four times as heavy as B. four times heavier as C. as four times heavy as D. as heavy as four times

单选题{{B}}Passage Three{{/B}} This country, as Lincoln said, belongs to the people. So do the natural resources which make it rich. They supply the basis of our prosperity now and hereafter. In preserving them, which is a national duty, we must not forget that monopoly is based on the control of natural resources and natural advantages, and that it will help the people little to conserve our natural Wealth unless the benefits which it can yield are given back to the people. Let us remember, also, that conservation does not stop with the natural resources. The principle of making the best use of all we have requires that we stop the waste of human life in industry and prevent the waste 'of human welfare which flows from the unfair use of concentrated power and wealth in the hands of men whose eagerness for profit blinds them to the cost of what they do. We have no higher duty than to promote the efficiency of the individual. There is no surer road to the efficiency of the nation.

单选题Sophie. Why don't you take your friends to the football game? Keith: ______ A. I don't think it's a clever idea. B. Can't you think of anything better? C. Well, they are not really football fans. D. Nothing is worse than this. They hate football.

单选题You can always ______Jim in a crisis, for he is simply the most helpful person I've ever known.

单选题 Most children with healthy appetites are ready to eat almost anything that is offered them and a child rarely dislikes food{{U}} (31) {{/U}}it is badly cooked. The way a meal is cooked and served is most important and an attractively served meal will often improve a child's appetite. Never ask a child{{U}} (32) {{/U}}he likes or dislikes a food and never discuss likes and dislikes in front of him or allow{{U}} (33) {{/U}}else to do so. If the father says he hates fat meat or the mother refuses vegetables, in the child's hearing he is{{U}} (34) {{/U}}to copy this procedure. Take it{{U}} (35) {{/U}}granted that he likes everything and he probably will. Nothing healthful should be omitted from the meal because of a supposed dislike. At meal times it is a good{{U}} (36) {{/U}}to give a child a small portion and let him come back for a second helping rather than give him as{{U}} (37) {{/U}}as he is likely to eat all at once. Do not talk too much to the child{{U}} (38) {{/U}}meal times, but let him get on with his food; and do not{{U}} (39) {{/U}}him to leave the table immediately after a meal or he will soon learn to swallow his food so he can hurry back to his toys. Under{{U}} (40) {{/U}}circumstances must a child be coaxed (哄骗) or forced to eat.

单选题Which of the following can be inferred about what sixteenth and seventeenth-century artists thought of watercolor painting in comparison to oil painting?

单选题When you are near a lake or a river, you feel cool. Why? The sun makes the earth hot, but it can't make the water very hot. Although the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth rises. Then the cool air over the water moves in and takes the place of the hot air. Then you feel the cool air and the wind, which makes you cool. Of course, scientists can't answer all of your questions. If we ask, "Why is the ocean full of salty" scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into the cracks. The rain then carries the salt into he earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, "What happens to the salt in the ocean? The ocean doesn't get more slat every year." Scientists are not sure about the answer to this question. We know a lot about our world. But there are still many answers that we do not have, and we are curious.

单选题The word "they" in "…together they threaten to confuse." (Line 3, Par

单选题Britain has the highest ______ of road traffic in the world--over 60 cars for every mile of road. A. popularity B. density C. intensity D. prosperity