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 -What the passage stresses about Sherpas is that they ----



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Reading passages

207 -What the passage stresses about Sherpas is that they ---- .
A) are members of a religious sect trying to ban mountain -climbing in Nepal 
B) climbed high mountains until the government forbade them in the 1960s 
C) are essential to climbers who want to conquer the mountains in Nepal 
D) don't approve of Europeans and Americans climb their mountain 
E) want to be the first people to climb Machhapuchhare 


 
 
60 
Plants can summon an insect rescue team when they are attacked by pests, just as if they 
were calling for a microscopic ambulance. In fact, researchers say the signal is specific 
enough to tell the helpful insects exactly what to expect when they arrive on the scene. For 
example, two kinds of caterpillars attack numerous crops and cost US farmers about $6 
billion annually. The plants summon a black, parasitic wasp that it is the natural enemy of 
the caterpillars. Scientists have known for years that plants could send out distress calls to 
wasps and other insect bodyguards, but they are just beginning to understand how 
sophisticated the messages can be. They hope to find out more about the signals and 
eventually use them to develop chemical -free pest control systems. 
208 -The passage states that ----- .
A) most of the agricultural crops produced in the USA are lost to pests 
B) caterpillars can help plants attacked by black wasps 
C) scientists have known all about plants' distress calls for years 
D) friendly insects can help plants against unfriendly ones 
E) researchers have only recently become aware of the distress calls of plants 
209 -According to the passage, further research into the plants' distress calls is 
necessary in order for scientists ---- .
A) to act promptly when plants need help 
B) to develop new chemicals to be used against pests 
C) to understand whether plants really have this ability 
D) to distinguish between useful and harmful insects 
E) to make use of them in the fight against pests 

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