单选题___ is announced in the papers, China has launched another man-made satellite.

单选题Being able to speak another language fluently is a great ______ when you look for a job.

单选题We all know that it is possible for ordinary people to make their homes on the equator (赤道), although often they may feel uncomfortably hot there. Millions do it. But as for the North Pole (北极)——we know that it is not only a dangerously cold place, but that people like you and I would find it quite impossible to live there. At the present time only the scientists and explorers can do so, and they use special equipment. Men have been travelling across and around the equator on wheels, on their feet or in ships for thousands of years ; but only a few men, with great difficulty and in very recent time, have ever crossed the ice to the North Pole. So it may surprise you to learn that, when traveling by air, it is really safer to fly over the North Pole than over the equator. Of course, it is not true about landings in the polar region, but the weather, if we are flying at a height of 5,000 meters above the Pole is a delight. At 4,000 meters and move above the earth you can always be sure that you will not see a cloud in the sky as far as your eyes can reach. In the tropics (热带), on the other hand, you are not certain to keep clear of bad weather even at such heights as 18,000 or 20,000 meters. Aeroplanes can"t climb as high or as quickly in cold air as in warm. Nor can clouds. In practice, this is an advantage to the aeroplane, which is already at a good height when it reaches the polar region and so does not to climb, while at the same time cold air keeps the clouds down low.

单选题Without proper planning, tourism can cause problems. For ex ample, too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too much traffic, the inhabitants become annoyed and unhappy. They begin to dislike tourists and to treat them impolitely. They forget how much tourism can help the country's economy. It is important to think a bout the people of a destination country and how tourism affects them. Tourism should help a country keep the customs and beauty that attract tourists. Tourism should also advance the well—being of local inhabitants. Too much tourism can be a problem. If tourism grows too quickly, people must leave other jobs to work in the tourism industry. This means that other parts of the country's economy can suffer. On the other hand, if there is not enough tourism, people can lose jobs. Businesses can also lose money. It costs a great deal of money to build large hotels, airports, air terminals, first—ass roads, and other support facilities needed by tourist attractions. For example, a major international—ass tourism hotel can cost as much as 50 thousand dollars per room to build. If this room is not used most of the time, the owners of the hotel lose money. Building a hotel is just a beginning. There must be many sup- port facilities as well. , including roads to get to the hotel, electricity, sewers to handle waste, and water. All of these support facilities cost money. If they are not used because there are not enough tourists, jobs and money are lost.

单选题______ for the timely investment from the general public, our company would not be so thriving as it is.

单选题If it ______ tomorrow, I'm afraid I won't attend the class.A. will rainB. is going to rainC. will rainD. rains

单选题When she (retires) in September 1989, (tennis champion) Christine Even was the (most famous) (woman athlete) in the United States.

单选题Salesgirl: Can I help you? We’ve got some new shirts here. Customer: OK, thanks. _________

单选题There must be ______ to keep it from happening.

单选题Amazingly, most of the infants stopped crying ______ they heard themselves in tapes.

单选题I clearly remember _____ something about this famous actor in a newspaper last month.

单选题These facts ______ show that he"s not to be trusted.

单选题Speaker A: I don't imagine you have your camera with you. The view is so fabulous I do not want to miss it. Speaker B: I did.bring my camera along. ______. A. But I'm afraid if you have ever seen it B. Unfortunately enough that the battery is still going on C. Unfortunately the battery inside is low D. And luckily enough it doesn't work

单选题I have lost so (much weight) recently (so) all my clothes are too big; I (must) have them (taken) in.

单选题His unhappy childhood ______ his bad temper. A. counts for B. accounts for C. makes for D. goes for

单选题Jack: Can I help with your luggage? Linda: ______

单选题All the useful energy at the surface of the earth comes from the activity of the sun. The sun heats and feeds creatures and mankind. Each year it provides men with two hundred million tons of grain and nearly ten million tons of wood, coal, oil, natural gas, and all other fuels are stored energy from the sun. Some was collected by this season"s plants as carbon compounds. Some was stored by plants and trees ages ago. Even waterpower derives from the sun. Water turned into vapor by the sun fails as rain. It courses down the mountains and is converted to electric power. Light transmits only the energy that comes from the sun"s outer layer, and much of this energy that is directed towards the earth never arrives. About nine tenths of it is absorbed by the atmosphere of the earth. In fact, the earth itself gets only one half millionth of the sun"s entire output of radiant energy.

单选题Paul is a very ______ character; he is never relaxed with strangers.A. self- consciousB. self- confidentC. self- servingD. self- satisfied

单选题The California lawmakers voted Thursday to raise the legal age to buy tobacco products from 18 to 21. The measure is part of a larger package of laws aimed at reducing tobacco use. If Governor Jerry Brown signs the bill, California will become the second state, after Hawaii, to raise the age limit for buying cigarettes and other tobacco products. More than 100 cities in the U.S., including New York and Boston, have already raised the age limit. A week ago, the California Assembly approved the measure, which—in addition to raising the age limit—treats electronic cigarettes the same as tobacco products, expands smoke-free areas, increases smoking bans and allows counties to collect higher taxes on cigarettes than the 87-cent per pack state tax. The Assembly"s vote came a few days after the city of San Francisco increased the age to buy tobacco products to 21. California lawmakers passed the bill despite lobbying (游说) from tobacco interests. The measure also faced opposition from many Republicans, who said the state should not be involved in policing people"s personal choices. "I don"t smoke. I don"t encourage my children to," said Republican Assemblyman Donald Wagner. "But they"re adults, and it"s our job to treat our citizens as adults." But supporters of the bill say raising the age to 21 moves legally purchased tobacco that much farther from younger kids. "This will save the medical system millions of dollars," said Democratic Assemblyman Jim Wood. (76) "It will save thousands of lives." A 2015 study by the Institute of Medicine "found that if the minimum legal age to buy tobacco were raised to 21 nationwide, tobacco use would drop by 12 percent by the time today"s teens reached adulthood. In addition, there would be 223,000 fewer premature(过早的) deaths and 50,000 fewer deaths from lung cancer."

单选题It was necessary that he ______his mother, otherwise she would have known this from someone else, and been very angry with him.