单选题He will come to call on you the moment he ______ his painting.

单选题The advantages and disadvantages of a large population have long been a subject of discussion among economists. It has been argued that the supply of good land is limited. To feed a large population, inferior land must be cultivated and the good land worked intensively. Other economists have argued that a large population gives more scope for specialization and the development of facilities such as ports, roads and railways, which are not likely to be built unless there is a big demand to justify them. One of the difficulties in carrying out a world-wide birth control program lies in the fact that official attitudes to population growth vary from country to country depending on the level of industrial development and the availability of food and raw materials. In the developing country where a vastly expanded population is pressing hard upon the limits of food, space and natural resources, it will be the first concern of government to place a limit on the birthrate, whatever the consequences may be. In the highly industrialized society the problem may be more complex. A de- creasing birthrate may lead to unemployment because it results in a declining market for manufactured goods. When the pressure of population on housing declines, prices also decline and the building industry is weakened. Faced with considerations such as these, the government of a developed country may well prefer to see a slowly increasing population, rather than one which is stable or in decline.

单选题What does the man do when he finds five pounds toe much?

单选题During the break she told me a lot of things, some of which were more than people could believe.A．打断时，她告诉我许多事，其中有些人比人们相信得要多。B．打断时，她告诉我许多事，其中有些事比人们相信得要多。C．休息时，她告诉我许多事，其中有些事简直不能使人相信。D．休息时，她告诉我许多事，其中有些事超过了人们的相信。

单选题Last night a fire ______ in that market, so the firm suffered a heavy loss.

单选题You'd better ______ the same things all the time. A) not to eat C) don't eat B) not eating D) not eat

单选题The longer I worked with Mr. Smith, the more I realized ______ in computer technology.A) how skillful he was C) how was he skillfulB) how he was skillful D) how skillful was he

单选题If he ______ tomorrow, he would find Mr. Wang in the office.

单选题The old man ______ son is a famous scientist never received any education~

单选题______ I saw her, I fell in love with her.

单选题A number of theories have been put forward about the possible causes of cancer.A) 理论上早已预言了癌症的病因。B) 人们就造成癌症的病因提出了许多理论。C) 大量的理论已经用于解释引发癌症的原因。D) 人们已经用大量理论来研究癌症的病因。

单选题 in ancient times, the book still appears to readers today.A) Though writtenB) It was writtenC) Though it writtenD) Written it was

单选题Never in his whole life ______such a stupid thing.

单选题That lazy boy went to class before he had prepared his lesson． A. 上课前，那个懒惰的小孩还没预习好。 B. 那个懒惰的小孩不预习就去上课。 C. 那个懒惰的小孩没有准备好课就到教室里了。 D. 在那个懒惰的小孩准备好课之前，他已经到了教室。

单选题With apples so cheap, we couldn't resist ______ four pounds.A. to take B. took C. taking D. have taken

单选题—I saw Anna in the library yesterday.—You______her; she is still abroad.A) must not seeB) can't have seenC) mustn't have seenD) couldn't see

单选题My children are looking forward to______a trip to Beijing next week．

单选题In the opinion of human resources officers, girls _______.

单选题How (can) you do such (thing) (without) (permission)? A. can B. thing C. without D. permission

单选题This passage mainly tells reader how ______.