搜题请搜索小程序“爱下问搜题”
问题 单项选择题

中毒性痢疾的发病机理中，起主要作用的是

A．痢疾杆菌内毒素引起全身毒血症状
B．胃肠道内正常菌群发生紊乱
C．痢疾杆菌大量繁殖引起病情加重
D．结肠急性弥漫性纤维蛋白渗出性炎症形成溃疡
E．机体免疫力低下

答案

参考答案：A

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．sustain

B．waste

C．consume

D．manufacture
查看答案
多项选择题

以下关于希腊字母说法正确的是（）。

A.Theta值通常为负

B.Rho随期权到期趋近于无穷大

C.Rho随期权的到期逐渐变为0

D.随着期权到期日的临近，实值期权的Gamma趋近于无穷大
查看答案