【单选题】
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。
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{{U}} (51) {{/U}}the solar energy increases. The release of the energy{{U}} (52) {{/U}}place along with the activity of the sunspots with a cycle of 11 years. This time, the{{U}} (53) {{/U}}of the storm exceeded expectations.
This{{U}} (54) {{/U}}of intense solar storm was caused by the eruption of a solar flare (闪光) and the ejection (喷发) of the solar corona (日冠) on October 28, 2003. Large amounts of charged particles moved 150,000,000 kilometers through space toward the {{U}} (55) {{/U}}in 19 hours. They could affect aircraft roaming (漫游) in space.
The high-energy particles will{{U}} (56) {{/U}}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{{U}} (57) {{/U}}because it is under the protection of the earth’s magnetic fielD、
A、solar storm not only affects aircraft but also is a{{U}} (58) {{/U}}to the environment and humans. The aerosphere and magnetic field of the earth can {{U}} (59) {{/U}}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{{U}} (60) {{/U}}the grounD、
The geomagnetic storm caused by this round of solar storm reaches its highest level on the two{{U}} (61) {{/U}}of the earth, which affects electricity supply of NorthAmericA、Overexposure to{{U}} (62) {{/U}}threatens the health of passengers on planes flying over the Polar Regions. If we fly in the sky during such a solar storm, it{{U}} (63) {{/U}} 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 {{U}} (64) {{/U}}a colD、Though this natural force is irresistible, scientists can still {{U}} (65) {{/U}}its movement accurately by monitoring. Facing successive solar storms, humans can’t drop their guarD、
B．when
C．until
D．though
网考网参考答案：B
网考网解析：
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