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（7）__________参考答案：
答案解析：
简答题：（7）__________
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（5）__________
（5）__________
According to the passage, before the Ice Age the continental
According to the passage, before the Ice Age the continental shelf was submerged
He purchased a ticket and went up on the top deck.
He purchased a ticket and went up on the top deck.A．A bought B．B took C．C showed
The phrase "coming back out of the cave" in the fifth paragr
The phrase "coming back out of the cave" in the fifth paragraph means __________
Which of the following is a totally arbitrary one?
Which of the following is a totally arbitrary one?A． Typewrite B． Crac C． Newspa