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问题 单项选择题

咳痰伴恶臭提示

A．肺炎球菌感染

B．链球菌感染

C．结核菌感染

D．葡萄球菌感染

E．厌氧菌感染

答案

参考答案：E

解析：不同感染时痰的性质不同，有一定的临床诊断意义，咳痰伴恶臭提示厌氧菌感染，肺炎球菌感染可咳铁锈色痰，结核菌感染可有咯血，绿脓杆菌感染有黄绿色或翠绿色痰，痰白粘稠、牵拉成丝难以咳出提示白色念珠菌感染等。

选择题

Dr. Peter , _____ headmaster of the school, told us, “______ fifth of pupils here go

on to study at Oxford and Cambridge.”

A．不填；A

B．不填；The

C．the; The

D．a; A
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单项选择题

Our ape-men forefathers had no obvious natural weapons in the struggle for (1) in the open. They had neither the powerful teeth nor the p claws of the big cats. They could not (2) with the bear, whose strength, speed and claws (3) an impressive " small fire" weaponry. They could not even defend themselves (4) running swiftly like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been (5) to failure and extinction. But they were (6) with enormous concealed advantages of a kind not possessed by any of their competitors.

In the search (7) the pickings of the forest, the ape-men had (8) efficient stereoscopic vision and a sense of color that the animals of the grasslands did not (9) . The ability to see clearly at close range permitted the ape-men to study practical problems in a way that lay far (10) the reach of the original inhabitants of the grassland. Good long-distance sight was (11) another matter. Lack of long-distance vision had not been a problem for forest-dwelling apes and monkeys because the (12) the viewpoint, the greater the range of sight-so (13) they had had to do was climb a tree. Out in the open, however, this simple solution was not (14) . Climbing a hill would have helped, but in many places the ground was flat. The ape-men (15) the only possible solution. They reared up as high as possible on their hind limbs and began to walk (16) . This vital change of physical position brought about considerable disadvantages. It was extremely unstable and it meant that the already slow ape-men became (17) still. (18) , they persevered and their bone structure gradually became (19) to the new, unstable position that (20) them the name Homo erectus, upright man.

18（）

A.However

B.Therefore

C.Meanwhile

D.Subsequently
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