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[单选题]
—I’ve told Nancy many times about the meeting, but she still forget it!
—understand. Actually, anyone ______ be very forgetful at times.(1分)
A
must
B
need
C
ought to
D
can
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参考答案
试题答案:
D
答案解释:
解题思路: 考查情态动词的用法 根据句意 表示可能性 ,只有can 能表示此意。must 必须 need 需要 ought to 应该
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Great changes____ in my hometown since I left for college in 1983.(1分)
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21. The sun sends out huge amounts of energy, not only to Earth, but to all other planets in the solar system and directly into space. The source of all that energy is nuclear fusion (核聚变) occurring at the sun’s core. The Large Helical Device being developed at the Ministry of Educational Institute for Fusion Science (NIFS) is essentially an “artificial sun” that aims to reproduce this nuclear fusion on Earth. “Nuclear fusion is a reaction in which nuclei of light atoms such as hydrogen combine to form nuclei of heavier atoms such as helium (氦). If we can utilize the huge amounts of energy released by this reaction, nuclear fusion will then constitute a completely new, clean and never ending source of energy,” says NIFS Director Atsui Iiyoshl. In many respects, fusion is far superior to the various conventional energy sources currently in use. Fusion seems to have tremendous potential as a new source of energy. But to produce fusion reactions on Earth, it is necessary to meet a set of critical plasmatic (等离子区) conditions, including ultra-high temperatures of 100 million degrees or so centigrade - a state that refuses to imagine. To meet this challenge, Japanese scientists have come up with their own unique helical device that is particularly safe and is suitable for continuous operation. The large Helical Device now being developed is expected to be completed by the end of next year, with experiments scheduled to start at the beginning of 1998.(10分)21.1 The phrase “artificial sun” in the first paragraph probably means “________”.(2分)A. a man-made sun B. NIFSC. the sun’s energyD. fusion science
23.5 The best title for the passage may be _____.
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____ recent discoveries it may be necessary to revise our previous theory.
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