Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each...

16/50

More than two hundred years ago _______.

the environment was polluted as much as it is today

people knew nothing about environmental pollution

air was polluted badly

people were faced with pollution

Giải thích

Hơn 2 trăm năm trước _______.

→ mọi người không biết gì về ô nhiễm môi trường

Thông tin: More than two hundred years ago, the term "environmental pollution" was quite strange to people.