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deep down, convince, essential, break down, tendency estimate, reveal, alternative, approve, digest |
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A. constituents B. ultimately C. exhausts D. economical AB. conventional AC. electricity AD. approximately BC. contributes BD. extent CD. substances ABC. generates |
Driving an electric car
The study was carried out by the University of Minnesota. The researchers estimated how levels of fine particulate matter (细颗粒物) and ground-level ozone — two important
It was no surprise that electric cars whose batteries were recharged with power from wind, solar or hydro-electric sources came out to be virtually free from harmful
Biofuels also caused more health problems than petrol. But diesel, which often
Overall, the study shows that electric cars are cleaner than those traditional vehicles only if the power used to charge then is also clean. That is hardly a surprise, but the