2. 外语
  3. At one time, scientists thought the space between Earth and Sun was a vacuum. But we now know that the sun fills it with gusts o

At one time, scientists thought the space between Earth and Sun was a vacuum. But we now know that the sun fills it with gusts o

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问题      At one time, scientists thought the space between Earth and Sun was a vacuum. But we now know that the sun fills it with gusts of hot, electrically charged atomic【B1】______ called the solar wind. Sometimes this wind blows hard. When the Sun’s outer layer is very active, it【B2】______   nearly one-third of its gaseous matter outward at supersonic speeds.
     The U.S. government’s oceans and atmosphere agency NOAA, has a Space Environment Center to monitor these【B3】______ . The center’s director, Ernest Hildner, says【B4】______ solar emissions are not dangerous to people on the ground, but can be a【B5】______ to airplane occupants and astronauts. They can also shut down satellites, power networks, communications, and other technical systems.
     Scientists have long known that solar storms are generated internally by the sudden【B6】______   of magnetic energy rising to the surface. Like a tightly【B7】______ rubber band, the Sun’s magnetic fields can suddenly snap into a new shape. Researchers have tried to predict solar storms by【B8】______  on these magnetic patterns. But【B9】______ . But how are they linked to solar storms?
     New satellite data have provided answers to U.S. government scientists and colleagues from the aerospace firm Lockheed Martin. They have revealed that【B10】______ . Lockheed Martin physicist Karel Schrijver says【B11】______ .
【B5】
选项
答案hazard
解析 hazard意为“危险，危险物”；根据空前的冠词a判断，此处所填词应为名词单数形式。
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