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【单选题】

Some birds like to sit on a sheep because ().

A.they can eat its parasites
B.they enjoy travelling with the sheep
C.they depend on the sheep for existence
D.they find the position most comfortable

A.
Most of the animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership (伙伴关系) which is good for both of them. You may see some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (寄生虫) on sheep. The sheep allow the lairds to do so because they move the cause of discomfort. So although they can live without each other, they do better together.
B.
Sometimes an animal has a plant partner. The relationship develops until the two partners can not live without each other. This is so in the corals (珊瑚) of the sea. In their skins there are tiny plants which act as "dustmen", taking some of the waste products from the corals and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are even pred from receiving light so that they cannot live normally, the corals will die.
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举一反三

【单选题】判断同类现象是否相似的充分必要条件为( )。

A.
单值性条件相似,已定的同名准则相等
B.
物理条件和几何条件相似,已定的同名准则相等
C.
物理条件和边界条件相似,已定的同名准则相等
D.
几何条件和边界条件相似,已定的同名准则相等

【单选题】55(). A.to B.with C.for D.between

A.
Bringing Art into Hospitals
B.
The medical world is gradually realizing that the quality of the (36) in hospitals may play an important (37) to help patients to get better.
C.
As (38) of nationwide effort in Britain to bring (39) out (40) the museums and into (41) places, some of the country’s best artists have (42) in to change older hospital and to soften the (43) edges of modern buildings. Of the 2500 national health service hospitals in Britain, almost 100 now have very valuable collections of present art in passages, waiting areas and treatment rooms.
D.
These recent movements first (44) by one artist, Peter Senior, who set up his studio at a Manchester hospital on northeastern England during the early 1970s. He felt the artist had lost his place in modern society, and (45) he should be enjoyed by a wider audience.
E.
A common hospital waiting room might have (46) 5 000 visitors each week, what a better place to hold regular exhibitions of art! Senior held the first exhibition of his own paintings in the out-patients waiting area of the Manchester Royal Hospital in 1975. Believed to lie Britain’s first hospital artist, Senior was so much (47) that he was soon joined (48) a team of six young art school graduates.
F.
The effect is (49) , now in file (50) and waiting rooms the visitors (51) a full view of fresh colors, playful images and restful countyards.
G.
The quality of the environment may (52) the used for expensive drugs when a patient is (53) from all illness. A study has shown that (54) who halt a view onto garden needed half the number of strong pain killers compared (55) patients who had no view at all or only a brick wall to look at.

【单选题】A.A B.B C.C D.D

A.
下列各式中r(t)是输入信号,c(t)是输出信号。判断哪个系统是非线性时变系统()。
相关题目:
【单选题】判断同类现象是否相似的充分必要条件为( )。
A.
单值性条件相似,已定的同名准则相等
B.
物理条件和几何条件相似,已定的同名准则相等
C.
物理条件和边界条件相似,已定的同名准则相等
D.
几何条件和边界条件相似,已定的同名准则相等
【单选题】55(). A.to B.with C.for D.between
A.
Bringing Art into Hospitals
B.
The medical world is gradually realizing that the quality of the (36) in hospitals may play an important (37) to help patients to get better.
C.
As (38) of nationwide effort in Britain to bring (39) out (40) the museums and into (41) places, some of the country’s best artists have (42) in to change older hospital and to soften the (43) edges of modern buildings. Of the 2500 national health service hospitals in Britain, almost 100 now have very valuable collections of present art in passages, waiting areas and treatment rooms.
D.
These recent movements first (44) by one artist, Peter Senior, who set up his studio at a Manchester hospital on northeastern England during the early 1970s. He felt the artist had lost his place in modern society, and (45) he should be enjoyed by a wider audience.
E.
A common hospital waiting room might have (46) 5 000 visitors each week, what a better place to hold regular exhibitions of art! Senior held the first exhibition of his own paintings in the out-patients waiting area of the Manchester Royal Hospital in 1975. Believed to lie Britain’s first hospital artist, Senior was so much (47) that he was soon joined (48) a team of six young art school graduates.
F.
The effect is (49) , now in file (50) and waiting rooms the visitors (51) a full view of fresh colors, playful images and restful countyards.
G.
The quality of the environment may (52) the used for expensive drugs when a patient is (53) from all illness. A study has shown that (54) who halt a view onto garden needed half the number of strong pain killers compared (55) patients who had no view at all or only a brick wall to look at.
【单选题】A.A B.B C.C D.D
A.
下列各式中r(t)是输入信号,c(t)是输出信号。判断哪个系统是非线性时变系统()。
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