摘要：34．Scientists think that the continents always where they today.A．aren’t,are B．aren’t,were C．weren’t,are D．weren’t,were
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Millions of youngsters across Europe could suffer ____ hearing loss after five years if they listen to MP3 players at too high a volume for more than five hours a week, EU scientists warned
- A.temporary
- B.permanent
- C.frequent
- D.extraordinary
Scientists are convinced _____ the positive effect of laughter _____ physical and mental health．
- A.of; on
- B.by; in
- C.of; at
- D.on; at
Scientists generally agree that the earth's climate will warm up over the next 50 to 100 years ________ it has warmed in the 20 000 years since Ice Age.
- A.so long as
- B.as much as
- C.as long as
- D.as well as