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- I have been trying to quit smoking.
- 共用题干 The Northern LightsThe Sun is stormy and has its own kind of weather It is so hot and active t...
- 共用题干 Migrant（移民的）WorkersIn the past twenty years,there has been an increasing tendency for workers ...
- We derive information mainly from the Internet.
- 共用题干 New Product Will Save livesDrinking water that looks clean may still contain bugs（虫子）,which ca...
- 共用题干 Canadian Parents Win Legal Battle against HomeworkUsually it is the children,not the parents,w...
- 共用题干 Germs（细菌）on BanknotesPeople in different countries use different types of money:yuan in China,...
- An Essential Scientific Process All life on the earth depends upon green plants. Using sunlight, th...
- 共用题干 “Liquefaction” Key to Much of Japanese Earthquake DamageThe massive subduction zone earthquake...
- 共用题干 Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where liv...