A. tries B. will try C. are trying D. have tried
A. hasn’t heard B. hasn’t been hearing C. hadn’t heard D. didn’t bear
A. The city inspires talented people. B. The city hurts your brain.
C. The city has many pleasures and benefits. D. The city seriously affects the natural balance.
A. citizen B. nature C. city D. stress
A. written B. given C. packed D. delivered
A. had registered B. have registered C. registered D. were registered
A. deeper B. slower C. further D. higher
A. happened B. were happened C. was happened D. had happened
A、her research has shed light on her understanding of cell phone
B、she found that cell phone exposure is harmful to human brain
C、she found that using a cell phone for about 50 minutes could influence or change brain activity
D、human brain is not responsive to electromagnetic radiation
A. It is dependent on Russia for gas and oil。
B. It has put an end to fossil fuels。
C. It had a major nuclear accident this year。
D. It is likely that they would rethink their nuclear power policies。
A. spend B. spending C. spent D. spends
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