2. 外语
  3. The modem society has witnessed amazing development in astrology. In recent years scientific investigation of comets has 【B1】___

The modem society has witnessed amazing development in astrology. In recent years scientific investigation of comets has 【B1】___

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问题 The modem society has witnessed amazing development in astrology. In recent years scientific investigation of comets has 【B1】______ because of a growing interest in the origin of the sun and 【B2】______ . Scientists want to learn how comets are formed. They think that such information will be 【B3】______ to man’s understanding of the origin of the 【B4】______ system.
    The word "comet" comes from the Greek and means "hairy object". In history comets have a special place. People believed that they brought news of death, 【B5】______ or military victories.
    The tails of comets provide 【B6】______ with spectacular sights at night. Comets tails are millions of kilometers long. The tail 【B7】______ reaches lengths of 250 kilometers and more.
    There was a written 【B8】______ of comet as early as 1770 B.C. The Chinese kept careful record and so did the Babylonians. 【B9】______ .
    The most famous comet in history is called Halley’s Comet. 【B10】______ .It was named after Edmond Halley, an English scientist. 【B11】______ The comet appeared in 1758, as he predicted, 16 years after his death and will return again in 1986.
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