D. The number of sunspots declines after coronal mass ejections.
3. According to the passage,NASA will launch a satellite to .
A. take images of the solar system
B. provide early warning of thunderstorms
C. keep track of solar activities
D. improve the communications on Earth
4. Which of the following might be the best title of the passage?
A. Solar Storms: An Invisible Killer
B. Solar Storms: Earth Environment in Danger
C. Solar Storms: Threatening the Human Race
D. Solar Storms: Human Activities to Be Troubled
【参考答案】28.1-4 BDCD
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