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- Traffic reaches its rush hour between 8:00 and 9:00 in the morning.
- 共用题干 第一篇Sleepless at NightIt was a normal summer night. Humidity（湿气）hung in the thick air.I couldnt...
- Our aim was to update the health service,and we succeeded.
- 共用题干 Early Ideas about the Universe1 Early man got his ideas about the universe by looking at the s...
- An Essential Scientific Process All life on the earth depends upon green plants. Using sunlight, th...
- 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 The RoadrunnerThe roadrunner（走雀）lives in the desert zone of the southwestern United States and...
- 共用题干 Learn about Light1 .Ancient civilizations were amazed by the existence of light for thousands ...
- 共用题干 Sharks Perform a Service for Earths WatersIt is hard to get people to think of sharks as anyth...
- 共用题干 Global WarmingFew people now question the reality of global warming and its effects on the wor...