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Two big guns are fired, and it is the _______ for the celebrations to begin.
A. mark B. sign C. signal D. symbol
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阅读下面短文,掌握其大意,然后从各题所给的四个选项中,选出一个最佳答案.
Jungle country is not friendly to man, but is possible to survive there. You must have the right 1 and you must 2 a few important things about the jungle. Then your chances of staying 3 are very good. In the jungle, you should always carry a 4 , Then you can 5 which way to go. Again and again you must alert(警惕)your 6 by it. Keep 7 . 8 the ground in front of you carefully. Stop and listen 9 .
If you lose your 10 , do not be 11 . Mark the 12 where you are with blazes on a tree. Then you can always know where you started.
Finding water that is safe to drink can be a 13 . Many streams and rivers carry germs that can be 14 to man. 15 , the jungle has many kinds of plants and vines that give water.
16 in the jungle is a science. Learn as much as you can about what to 17 in the jungle. Then no part of the jungle will seem completely unfriendly or 18 . 19 , you will be able to“ 20 ”it for a long time.
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Isn't it time you got down to_______ the papers?
A. mark B. be marked C. being marked D. marking
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When you read an English book, make a mark_______ you come across a new word.
A. what B. where
C. as D. which
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