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问题 多项选择题

筛窦骨折时常可出现（）

A.脑脊液鼻漏

B.Marcus-Gunn瞳孔

C.视力严重减退

D.鼻根部扁平宽大，内眦间距增宽

E.鼻出血

答案

参考答案：A, B, C, D, E

解析：筛骨水平板及筛顶均为颅前窝底的一部分，因其骨质菲薄，又与硬脑膜等连接紧密，故筛窦骨折易伴发脑脊液鼻漏，后组筛窦与视神经管毗邻，外伤有可能损伤视神经；如果筛窦损伤累及其中的筛前动脉，则鼻出血或眶后血肿不可避免。

解答题
已知{an}为等比数列，a3=2，a2+a4=
20
3
，求{an}的公比q及其通项公式．
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填空题

Part 4


Questions 26-45


·Read the following passage and decide which answer best fits each space.
·Forquestions26-45, markoneletterA, B, C or D on the Answer Sheet.
Both (26) and zoology are parts of a more general field of science, biology. The two are studies of (27) things, which share certain characteristics, (28) they are plants or animals. Botany deals with plants, whose organisms that can (29) their own food by the use of sunlight. Zoology on (30) hand, deals with animals, those organisms that cannot manufacture their own food and are thus dependent (31) plants for their food.
(32) plants and animals share many abilities, the extent (33) which plants can exercise some of those abilities is (34) . For example, both plants and animals need food, water, and warmth for growth, (35) plants can move to (36) those needs only by the slow extraction of their leaves and roots, while animals can move relatively (37) distances in relatively little time. When an animal is hurt with needle, the animal will (38) the part of the body (39) . This ability to draw back (40) pain or irritation, called irritability, is found only to a very limited extent in plants.
If plants (41) the same (42) as animals, animals would have had a more difficult time finding food. If animals were as limited as plants, they might (43) a means of manufacturing their own food, as plants do now. The world would be a very different place (44) it is if the characteristics of plants and animals were (45)

A．in

B．to

C．with

D．on
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