单选题When Mr. Jones gets old, he will______ his business to his son.

单选题You have been badly injured in a car accident. It is necessary to give you a blood transfusion(输血) 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 (通用献血者). For the opposite reason, AB is sometimes called universal recipient. However, because so many reactions can occur in transfusions, patients usually receive only salt or plasma (liquid) 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Peter worked so fast with the maths problems ______ a lot of mistakes. A) as to make C) to make B) that made D) that he made

单选题In the United States and Canada, a prom, short for promenade, is a formal dance, or getting together of high school students. It is always held near the end of the junior and/or senior year. It is a major event among high school students. High school juniors taking part in the prom may call it Junior Prom while high school seniors may call it Senior Prom. In fact, it is always a dance for both juniors and seniors. At prom, a Prom Queen and Prom King may be showed. Other students may be honored to take part in a "Prom Court". Prom Queen and Prom King are honorary titles (荣誉称号) given to students who are chosen in a school-wide vote (投票) before the prom. Whether you can be a member in a Prom Court is due to the popularity of those chosen and their level of participation in school activities including sports. This honor is usually given to seniors. In addition to Prom Queen and Prom King, juniors may also be honored, but would be called "Prom Prince" or "Prom Princess". The British would call it Leavers" Ball or Leavers" Dinner formally, or informally, Leavers" Do. This is closer to the Australian description, although in the UK, some schools have called the above events proms. In Canada, Ireland and Australia the terms Grad or Formal are most commonly used and the event is usually held for those graduating high school or middle school. In Ireland, the event is also known as the Debs, which is derived (源自) from Debutante.

单选题It is recommended that the project ______ until all the preparations have been made. A．is not started B．is not to be started C．not be started D．will not be started

单选题Dear Professor Smith, Would it be possible for you to give one of your lectures on America before the Spring Symposium (专题讨论会) to be held at our university on March 2nd, 1990? We have heard so much about your excellent work in America research that we are eager to have you accept our invitation. If you can accept our invitation, will you let us know before February 20 what your terms are and what facilities we should prepare for showing?

单选题She had three daughters, all ______ became nurses.

单选题Faceless, bodiless "virtual"(虚的) communication may be less psychologically satisfying than actual conversation, and the relationships formed through it may be shallower.

单选题He has not quite solved the problem yet, but he is ______ it.

单选题At the meeting both sides exchanged their views on a wide ______ of topics they were interested in. A. collection B. density C. extent D. range

单选题Little ______ about his own safety, though he was in great danger himself. A) does he care C) did he care B) he cared D) he cares

单选题As requested we enclose our latest catalogue and price list. I"m certain that our autumn products will be interesting to your customers as they are of latest design and space age material. With the global warming trend, such light decoration stuffs are getting more and more popular.

单选题Many theories on the causes of juvenile delinquency(青少年犯罪)focus either on the individual or on society as the major contributing influence. Theories centering on the individual suggest that children engage in criminal behavior because they were not sufficiently(足够地)penalized(对…处以刑事惩罚)for previous misdeeds or that they have learned criminal behavior through interaction with others. Theories focusing On the role of society suggest that children commit crimes in response to their failure to rise above their socioeconomic(社会经济的)status，or as a rejection(抵制) of mid-die-class values.

单选题While boys of her age bring home low marks，the girl may easily get good grades. Girls seem to have “better brains”in sch001．Why，then，do so few girls become great scientists? Why is the most important thinking in adult society done by men? And once you’ve decided where you’re going，you can easily purchase your ticket online from services within the Yahoo! Travel property，which searches hundreds of flights to anywhere in the world and includes the latest pricing information.

单选题I had to wait for another two months to be able to have the car ______.

单选题From the passage, we can know that the computer system can provide information of ______.

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单选题You have been badly injured in a car accident. It is necessary to give you a blood transfusion. 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.

单选题He will never seem to be successful, ______ hard he tries because no one is supporting him.A) howeverB) wheneverC) whereverD) whatever