单选题Staying alone in the house she was ______ when she heard someone knocking at the door.

单选题She called a technician into her office and wanted ______ immediately. A. the computer is repaired B. the computer repaired C. the computer was repaired D. him repair the computer

单选题If I ______ time I would go to the office.A) hadB) haveC) have badD) would have

单选题Many things have happened _______I saw you.

单选题When people print a stamp, any error made on a stamp raises its value to stamp collectors. A mistake on one inexpensive postage stamp has made the stamp worth a million and a half times its original value. More than one hundred years ago in the British colony(殖民地) of Mauritius, a small island in the Indian Ocean, the mistake was made. In 1847 an order for stamps was sent to a London printer -- Mauritius was to become the fourth country in the world to issue stamps. Before the order was filled and delivered, a bail was planned at Mauritius"s Government House, and stamps were needed to send out the invitations. A local printer was instructed to copy the design for the stamps. He accidentally inscribed the words “Post Office” instead of "Post Paid" on the several hundred stamps that he printed. Today there are only twenty-six of these misprinted stamps left-fourteen One Penny Orange - Reds and twelve Two Penny Blues. Because of the Two Penny Blues" rareness and age, collectors have paid as much as $16,800 for it.

单选题It is implied by the writer that ______.

单选题Unless the application of a new discovery is clear and present, most are dubious of its value.

单选题If you do it ______ , do it well.

单选题Such being the case, we have no choice but to request you to amend relative contract terms. A.我们没有选择，只有出现如此情景，即请求你修改相关的合同方面。 B.鉴于此种情况，我们只好请贵方修改合同有关条款。 C.在这种情况下，我们不得不要求你修改相关的合同内容。 D.如此情况下，我们没有选择，只有请求你修改合同相关条款。

单选题From this passage we can know that ______.

单选题The school principal and the teachers should take the ______ for keeping the class in order.

单选题It is clear that some people who participate in exercise training will develop injuries to their bones, muscles, and joints (关节). Despite unfounded reports in the mass media of extremely high injury rates among adult exercisers, there have been few good studies of exercise injuries in populations. One of the difficulties in performing such studies has been the need to identify both the number of cases and the number of people at risk for injury. In other words, it is difficult to know the number of individuals injured and the total number of individuals exercising in the population. But these two figures are necessary in order to calculate (统计) true injury rates. Normally, injury is defined as an accident that causes a person to stop exercising for at least one week. The best available studies on injury rates show that about 25 to 30 percent of adult runners become "injured" (based on the above definition) over the course of a year. More serious injuries include those for which the injured person seeks medical care. If only they are considered, injury rates are much lower, perhaps in the range of 1 percent per year. Little is known about the causes of exercise injuries. One factor that has been linked to injury is the amount of exercise; for example, individuals who run more miles are likelier to be injured than those who run fewer miles. Factors such as age, sex, body type, and experience have not been shown to be associated with risk of injury. It seems logical that structural abnormalities, sudden increases in training intensity, and types of equipment used are likely to be related to injury risk. However, data to support these opinions are not available.

单选题There are many different plastics materials with many different properties, but they all have certain features in common.

单选题The DNA test, together with other tests, the prisoner's innocence.

单选题______ one of the subjects that appeal to many university students.

单选题We could not have fulfilled the task in time if it ______ for their help.

单选题______ my opinion, customer service here has improved but not as much as expected over the last 2 years.

单选题

单选题Don't pick up strange boys.

单选题If you are overcome with fear, ______.