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- 21The people of the coral island nations are unable to do anything substantial about the problem of global warming.
A.Right
B.Wrong
C.Not mentioned
开始考试练习点击查看答案 - 22Some industrialized countries are unwilling to spend money in reducing pollution.
A.Right
B.Wrong
C.Not mentioned
开始考试练习点击查看答案 - 23Eta Carinae is now engaging in
A.some very common behaviour
B.some very dull behaviour
C.some very frightening behaviour.
D.some very strange behaviour
开始考试练习点击查看答案 - 24The word “period” in Paragraph 3 means the length of time
A.over which star vary in brightness
B.for which Eta carinae’s brightening lasts.
C.Eta carinae takes to become a supernova.
D.it takes the laser from Eta carinae to travel to the earth.
开始考试练习点击查看答案 - 25Eta Carinae is hard to observe because
A.it is too far away.
B.there is too much dust and gas around it.
C.the binoculars are not powerful enough.
D.it does not send out infrared light.
开始考试练习点击查看答案 - 26Astronomers are particularly interested in Eta Carinae because
A.it is in its final stage.
B.it is a supernova.
C.it exploded in 1987.
D.it is brighter than the sun.
开始考试练习点击查看答案 - 27Which of the following statements about Eta Carinae is NOT true、
A.It will end up as a supernova.
B.It can be seen only through binoculars.
C.It is the only star that sends out an ultraviolet laser.
D.Its ultraviolet laser is brighter than that of the Sun.
开始考试练习点击查看答案 - 28According to the passage, which of the following has changed the most in the last 500 years、
A.Food
B.Clothing
C.Ideology.
D.Languag
开始考试练习点击查看答案 - 29“Some” in the last sentence of the first paragraph refers to
A.some cocoa trees.
B.some chocolate drinks.
C.some shops.
D.some south american indians.
开始考试练习点击查看答案 - 30Thousands of Irish people starved during the “Potato Famine” because
A.they were so dependent on potatoes that they refused to eat anything else.
B.they were forced to leave their homeland and move to america.
C.the weather conditions in ireland were not suitable for growing potatoes.
D.the potato harvest was bad.
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