Đề TS chuyên KHTN 1995
Đề TS Chuyên Anh Nguyễn Du
... leaving C had left D leave 29 Scientists say it is essential that mankind _ the amount of air pollution in big cities A be reduced B reduced C reduce D will reduce 30 I had difficulty _ her ... directions Many communities are burning garbage and other biological waste products to produce electricity Changing waste products into gases or oil is also an efficient way to dispose of waste Experim...
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