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单选题 I couldn't go to the meeting because I had to ______ my brother after his accident.

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单选题 Researchers are trying to ______ what's wrong with their experiments.

单选题 If a child is absent ______ school for long periods, he should be given extra work.

单选题 He claimed ______ in the supermarket when he was doing shopping yesterday.

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单选题 There are many interesting news items in BP's (英国石油公司) annual Energy Outlook just published. But perhaps the most astonishing suggestion in the report is the idea that cutting back on plastic use could make matters worse. This might be what you would expect BP to say. After all, as one of the world's biggest oil companies, it makes a lot of money from selling products in plastic. But let's look at the thinking behind BP's argument. If the current opposing idea about the use of plastic continues, there could be a worldwide ban on single-use plastics by 2040. But the document argues that switching plastic for other materials will have a bigger cost in terms of energy and carbon emissions (排放). That sounds like the law of unintended (非故意的) consequences in action. When plastic bags are measured against paper or cotton substitutes, a BBC analysis found there wasn't a great deal of difference in their environmental impact. Paper bags require fewer reuses to make them more environmentally friendly than single-use plastic bags, which means customers have to replace paper bags more frequently. Environmentalists, though, are not entirely convinced. They think that BP is stressing the problem of banning plastic for its own interest. 'While it's true that it takes less energy to produce and transport plastic than glass, a glass bottle can be reused dozens of times and is recyclable. Plus, materials like glass when they escape collection don't go on polluting our oceans and rivers for hundreds of years,' said Louise Edge, from Greenpeace UK. Steps to encourage recycling are being taken. The UK, for example, will introduce a new tax on the manufacture and import of plastic packaging in 2022. There are also lots of developments taking place with alternative materials. These may be the final defense against the unintended consequences of plastic bans.

单选题 A. Hold the line B. flight number C. ask a question D. To New York E. May I have your name F. reconfirm my seat G. please check in H. On May 2nd Reservations clerk: Northwind Airlines. Can I help you? DanielAdams: Hello. I'd like to 56 , please. Reservations clerk: May I have your name and 57 , please? Daniel Adams: My name is Daniel Adams and my flight number is 374. Reservations clerk: When are you leaving? Daniel Adams: 58 Reservations clerk: And your destination? Daniel Adams: Buenos Aires. Reservations clerk: 59 , please... All right. Your seat is confirmed, Mr. Adams. You'll be arriving in Buenos Aires at 4 o' clock p. m. local time. Daniel Adams: Thank you. Can I pick up my ticket when I check in? Reservations clerk: Yes, but 60 at least one hour before departure time.

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单选题 It is ______ for me to carry.

单选题 In general, the amount that a student spends for housing should be held to one-fifth of the total ______ for living expense.

单选题 They found the lecture hard ______.

单选题 You have been badly injured in a car accident. It is necessary to give you a blood transfusion because you lost a great deal of blood in the accident. However, special care must be taken in selecting new blood for you. If the blood is too different from your own, the transfusion could kill you. There are four basic types of blood; A, B, AB and O. A simple test can indicate a person's blood type. Everybody is born with one of these four types of blood. Blood type, like hair color and height, is inherited from parents. Because of substances contained in each type, the four groups must be transfused carefully. Basically, A and B cannot be mixed. A and B cannot receive AB, but AB may receive A or B. O can give to any other group, hence it is often called the universal donor. For the opposite reason, AB sometimes called the universal recipient. However, because so many reactions can occur in transfusions, patients usually receive only' salt or plasma until their blood can be matched as exactly as possible in the blood bank of a hospital. In this way, it is possible to avoid any bad reactions to the transfusion. There is a relationship between your blood type and your nationality. Among Europeans and people of European ancestry, about 42 percent have type A while 45 percent have type O. The rarest is type AB. Other races have different percentages. For example, some American Indian groups have nearly 100 percent type O.

单选题 There's been a(n) ______ about the weather.

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单选题 Five minutes earlier, ______ we could have caught the last train.

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