单选题Women sometimes fired cannons in battle because ______.

单选题MacFarlane gave some suggestions that ______.

单选题______ fairly recently, ______ solved, at least partially. A. Until… that this problem was B. It was until… that this problem was C. Not until… was this problem D. It was not until… when this problem was

单选题A. squareB. fareC. areD. rare

单选题—Who has been planning the dance? —Everyone in the class ______.

单选题Your {{U}}analogy{{/U}} was not a good one because the two situations are not similar.

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Father advised me not to say anything until ______ at the meeting.A. askingB. to askC. askedD. ask

单选题Studying in the boarding school, the students will become ______.

单选题The older view is that the laws of Nature are absolute, though they may have been inaccurately ______.

单选题The shop assistant was fired as she was ______ of cheating customers.

单选题In spite of the strong opposition to new and strict environmental laws, however, it is still possible to attack the problem of chemical pollution; but we must attack it from three directions. First, we need more independent research into the effects of chemicals by scientists who are not paid by the government or by large industrial companies. Second, scientists need to educate the general public and inform them about the dangers of chemicals in the environment. If the public knows that a certain chemical threatens the health of their children, then it will put pressure on politicians in office, they will take action to correct the long-term economic costs of chemicals. It will be extremely expensive to clean areas of land which are contaminated (污染) by chemicals; it will be even more costly to give medical treatment to people who are suffering from serious illnesses after exposure to dangerous chemicals. If governments realize this, the short-term economic benefits of chemicals will seem much less attractive to them. If we can put pressure on governments in these three ways, perhaps they will begin to behave more responsibly. They will perhaps pass new laws against pollution and enforce them strictly. Perhaps, then, the chemical producers will begin to behave more responsibly.

单选题Eye contact is important in relationship because it ______to show attention and interest.

单选题Woman: I don't think we should have told Tom about the surprise party for Lucy. Man: It's all right. He promised not to tell, and he doesn't make promises lightly. Question: What does the man mean? A. Tom has arranged a surprise party for Lucy. B. Tom will keep the surprise party a secret. C. Tom and Lucy have no secrets from each other. D. Tom didn't make any promise to Lucy.