a. right b. wrong c. not mentioned
解析:
题干认为地球安全因为有磁场在高空包围着地球,将太阳风挡在地球大气层外。这与文章第二段第一句的意思是一致的。
3. some scientists are worrying about the possible disappearance of the earths protective magnetic field in the future.
a. right b. wrong c. not mentioned
解析:
题干认为有些科学家担心包围地球起防护作用的磁场有一天会消失。这在文章中没有提到。
4.the auroras are formed when the electrons falling into the earths atmosphere at the poles and colliding with gas molecules in the atmosphere.
a. right b. wrong c. not mentioned
解析:
文章第二段和第三段解释极光的成因。当强大的太阳风侵入地球磁场,磁场的磁力线会断开和闭合,等离子流的电子进入大气层,流向极地上空,与大气层的气体分子发生碰撞,发出极光。这个意思与文章相符。
5.you cannot see the northern lights unless you are in alaska or canada.
a. rightb. wrong c. not mentioned
解析:
根据文章表述watching auroras is fun and exciting, but normally you can only see them in places far north like alaska and canada. the movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate, flicker, or even move like waves. during solar maximum, auroras are seen as far south as florida, even mexico!可见题干是错误的表述
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