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67 What does the author think is a surprise?A. Teen smokers are price sensitive.B. Some states still keep the tobacco tax low.C. Tobacco taxes improv
EThe need to feed a growing population is putting much pressure on the world’s supply of water. With 97% of the world’s water too salty to be drunk o
37_________A. pressureB. impressionC. debateD. attention
In the experiment, the burning inside the bottle can___.A. equalize the air pressure inside and outsideB. make a seal in the neck of the bottleC. fin
A.brightnessB.photosensitiveC.emitterD.light-sensitive
A. effectiveB. sensitiveC. ordinaryD. careful