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36.C。推理題。題干：太陽風的形成是因為__________。由關鍵詞solar wind可找到第一段的第二、三句“Energy flows away from the Sun toward the Earth in a stream of electrified particles that move at speeds around a million miles per hour.These particles are called plasma，and the stream of plasma coming from the Sun is called the solar wind.”，即“能源從太陽向地球以帶電粒子流的形式流逝，以大約每小時一百萬英里的速度移動。這些粒子被稱為等離子，來自太陽的等離子流叫作太陽風。”由此可知太陽風與能量流有關，故選C。

　　37.B。推理題。題干：當太陽風到達地球的時候會發生什么?根據第二段的第三句“The charged particles become trapped in magnetic belts around the Earth.”可知，帶電粒子變成被困在地球周圍的磁帶。由此可知B正確。

　　38.A。推理題。題干：當__________時，就形成了北極光。根據第三段的最后一句話“As the electrons fall into the Earth，they collide with gas molecules in the atmosphere，creating flashes oflight in the sky.”可知，由于電子粒落到地球，它們與大氣中的氣體分子發生碰撞，產生的光線在天空中閃爍。根據第四段所述的“Each atmospheric gas glows a different color.Oxygen and nitrogen glows red and green and nitrogen glows violet-purple.As these various colors glow and dance in the night sky,they create the Northern Lights and the Southern Lights.”可知，每種大氣氣體發光的顏色不同，氧氣和氮氣發出的光不同，這些不同顏色的光芒，構成了夜空中的北極光。綜上所述，可知A正確。

　　39.A。細節題。題干：下列有關北極光的敘述，哪項是正確的?根據倒數第二段的第二句 “The movement of the aurora across the sky is usually slow enough to easily follow with your eyes but they can also pulsate(跳動)，flicker(閃爍)，or even move like waves.”可知，通常足夠慢的極光劃過天空的運動很容易被眼睛看到。由此可知A正確。.

　　40.D。態度題。題干：作者對北極光持什么態度?根據文章的最后兩句話“We hope you are able to travel to far-north places like the Arctic Circle and see the Northem Lights at least once during your lifetime.We know you will never forget it!”可知，作者建議讀者可以到北極圈以北的地方看到北極光，你將永遠不會忘記。