When you get involved in sports, a lot of racial are broken down because players developed friendship quickly. A．barriersB．threatsC．approachesD．hardships 题目和参考答案——青夏教育精英家教网—

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When you get involved in sports, a lot of racial____are broken down because players developed friendship quickly.

A．barriers

B．threats

C．approaches

D．hardships

试题分析：句意：当你参加运动的时候，很多种族的障碍被打破，因为选手们很快就培养了友谊。四个选项的含义分别是：A. barriers障碍，B. threats威胁，C. approaches方法，D. hardships困难，所以选A。

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Title	Zebras have their own bug repellent?
Reasons for zebras developing their strips	Original belief	With the black and white lines, one zebra is difficult to single out while traveling with a herd, thus ___小题1:___ it from its enemies.
Reasons for zebras developing their strips	New theory	Zebras, residing in Africa where there are most horseflies in the world ,have developed strips to avoid being___小题2:____ .
A study	Researchers	A team of scientists from ___小题3:____
	____小题4:____	To test if strips are developed to make zebras less attractive to flies.
	Clues	White or light-colored horses are less __小题5:___ to get bitten than dark ones. Zebras develop strips as they grow older though born black .
	Method	Some boards at a horse farm are painted with patterns of black and white stripes variously ___小题6:___ , a layer of glue applied on them Measured the polarized light reflected from real zebra skins
	_____小题7:___	The places where the black and white stripes were similar to the ___小题8:___zebras have attracted the fewest flies Strips of zebras matched light patterns that were the least attractive to horseflies
Principle of zebras’ black and white strips repelling the flies		Horizontally polarized light, which white does not reflect, ____小题9:___ to horseflies.
Conclusion		____小题10:___tested on real zebras, the theory isn’t definitely true.