单选题We can guess that the topic of the passage following this one ______.

单选题He could repair the car himself but he would rather his son ______it. A. do B. to do C. did D. has done

单选题In medicine, blood type is the classification of red blood cells by the presence of specific substances on their surface. In the early part of the 20th century, physicians discovered that blood transfusions often failed because the blood type of the recipient was not compatible with that of the donor. In 1901 the Austrian doctor Karl Landsteiner classified blood types and discovered that the hereditary blood factor is of great importance in blood transfusions because it creates reactions that can threaten the life of newborn infants. The four blood types are known as A, B, AB, and O. Blood type A contains red blood cells that have a substance A on their surface. This type of blood also contains an antibody directed against substance B, which can be found on the red cells of persons with blood type B. Type B blood contains the opposite things. Blood type AB contains neither antibody, but red cells in this type of blood contain both A and B substances. In type O blood, neither substance is present on the red cells, but the individual is capable of forming antibodies directed against red cells containing substance A or B, If blood type A is transfused into a person with B type blood, anti-A antibodies in the recipient will destroy the transfused A red cells. Because O type blood has neither substance on its red cells, it can be given successfully to almost any person. Persons with blood type AB have no antibodies and can receive any of the four types of blood; thus blood types O and AB are called universal donors and universal recipients, respectively. Other hereditary(遗传的) blood-group systems have subsequently been discovered, for example, the Rh blood factor. And nowadays more than twenty additional blood types have been discovered. Their importance is obvious.

单选题If Party B's Products fail to meet the standard and requirements provided in this Contract during the Inspection and Acceptance undertaking by Party A, Party A shall, while keeping such products in secure and good condition, notify Party B its objection in written within 7 days of receipt of Party B's Products. If Party A fails to notify Party B its objection on such products in written prior to the expiration of the above time limit, all products delivered by Party B shall he deemed eligible and qualified under this Contract and subsequently Party A shall have no reason to withhold the payment of Party B's Products.

单选题In our English class, our teacher pays great attention ______ conversational skills.

单选题He won't leave until she ______ back.A) cameB) comesC) comeD) coming

单选题______a taxi, otherwise you'll miss your train and the ticket will expire.A) TakenB) TakeC) To takeD) Taking

单选题It was in 1969_____the American astronauts first succeeded in landing on the moon.

单选题Every employer wants and needs employees who can suggest improvement in an honest and constructive manner.

单选题If I ______ time I would go to the office.

单选题Some of the experiments ______ in our textbook were very difficult to carry out. A. to describe B. described C. describing D. to have described

单选题—I'm sorry. I'm late. — ______ , Lin.

单选题The passage tells us that some manufacturers, instead of changing their product, would prefer to change its ______.

单选题More than one government official ______ involved in the case.

单选题The increase in international trade has lead to the demand for employees with the ability to communicate in a foreign language.

单选题_____, the people in the flooded areas could not have rebuilt their homes.

单选题He made a ______ for some water.

单选题 BConversation 1Questions 6 and 7 are based on the following conversation./B

单选题I don't let my baby go out in this weather ______ he should catch cold. A. in case B. now that C. as though D. so that

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