Choose the letter A, B, C or D to complete the passage below
Air pollution is one of _________ (6) problems of the current time all over the world. There ___________ (7) a lot of reasons for this pollution. First of all, the release of air pollutants such as smog and solid materials cause air pollution and health issues ___________ (8) human. ___________ (9) dirty wastes in big cities are polluting the whole atmospheric air. Thirdly, motor vehicles are releasing polluted gases contributing to the air pollution. Finally, some natural ________ (10) like dust, soil particles, and natural gases are also the source of air pollution.
Question 9:
A. Thirdly
B. Secondly
C. Fourthly
D. fifthly
Chọn đáp án: B
Giải thích:
theo trình tự mạch văn, sau “first of all” là “secondly”
Dịch: Thứ hai, rác thải ở các thành phố lớn đang làm ô nhiểm cả hệ khí quyển.
