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  3. 下面的短文有15处空白，请根据短文内容为每处空白确定1 个最佳选项。 Solar Storm At the end of October 200...

下面的短文有15处空白，请根据短文内容为每处空白确定1 个最佳选项。 Solar Storm At the end of October 200...

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问题 下面的短文有15处空白，请根据短文内容为每处空白确定1 个最佳选项。
Solar Storm
At the end of October 2003, a sudden solar storm hit the earth. A solar storm refers to the large amounts of charged particles released into space__________ (1) the solar energy increases. The release of the energy__________ (2) place along with the activity of the
sunspots with a cycle of 11 years. This time, the __________ (3 ) of the storm exceeded expectations.
This  (4) of intense solar storm was caused by the eruption of a solar flare（闪光） and the ejection （喷发） of the solar corona （日冕） on October 28, 2003. Large amounts of charged particles moved 150,000,000 kilometers through space toward the __________ (5) in 19 hours. They could affect aircraft roaming （漫游）in space.
The high-energy particles will__________ (6 ) some of the parts of an aircraft. They may also cause it to fail. High-energy particles can threaten the safety of an aircraft at a high orbit. If an aircraft orbits at a lower orbit, it is __________ (7) because it is under the protection of the earth’s magnetic field.
A solar storm not only affects aircraft but also is a __________ (8) to the environment and humans. The aerosphere and magnetic field of the earth can__________ (9) humans from ultraviolet radiation and X-rays. While most of the X-rays are absorbed after they enter
the aerosphere （大气层）， still a few can __________ (10) the ground.
The geomagnetic storm caused by this round of solar storm reaches its highest level on the two__________ (11) of the earth, which affects electricity supply of North America. Overexposure to __________ (12) threatens the health of passengers on planes flying over the Polar Regions. If we fly in the sky during such a solar storm, it __________ (13) we receive ten times the X-ray radiation. It’s really damaging.
Scientists say a solar eruption is like the sun sneezing, which will make the earth __________ (14) a cold. Though this natural force is irresistible, scientists can still __________ (15) its movement accurately by monitoring. Facing successive solar storms, humans can’t drop their guard.

（1）
选项 A since
B when
C until
D though
答案B
解析
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