What is a serious problem of Lake Baikal in Russia?
A. The government did not have the power to enforce laws and regulations.
B. It contains a rich variety of animals and plants.
C. It is polluted by massive volumes of industrial wastes discharged into it.
D. It has 1, 300 rare species that do not exist anywhere else in the world.
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Chọn đáp án C
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Chinese ______ by more than one billion people all over the world.
In the 18th century, workers liked wearing jean cloth because it was strong and did not ______ easily.
Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correcting in each of the following questions.
