1. The phrase “communications blackout” in Paragraph 1 most probably refers to　during the 2017 Olympics.　

　　A. the extinguishing of the Olympic torch

　　B. the collapse of broadcasting systems

　　C. the transportation breakdown in London

　　D. the destruction of weather satellites

　　2. What can be inferred about the solar activity described in the passage?

　　A. The most fatal matter from the corona falls onto Earth.

　　B. The solar storm peak occurs in the middle of each cycle.

　　C. It takes several seconds for the charged matter to reach Earth.

　　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】1—4、BDCD

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