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- 共用题干 Travel Across AfricaFor six hours we shot through the barren（荒芜的）landscape of the Karoo desert...
- 共用题干 Unlocking the Human Genome（基因组）1 A project to unlock secrets一what scientist could resist that ...
- 共用题干 Chimpanzees1 Chimpanzees（黑猩猩）will soon be extinct（灭绝）.If the present rate of hunting and habit...
- 共用题干 Giant StructuresIt is an impossible task to select the most amazing wonders of the modern worl...
- The walls are made of hollow concrete blocks.
- Although I sympathize,I cant really do very much to help.
- There is always excitement at the Olympic Games when an athlete breaks a prevous record of performan...
- 共用题干 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...
- If headaches only occur at night,lack of fresh air is often the cause.
- 共用题干 Caribbean IslandsWhat would you see if you took a cruise to the Caribbean Islands?Palm trees a...