Less is known about the cause of the common cold than about the causes

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Mark the letter A, B , C or D on your answer sheet to indicate the sentence that is CLOSEST in meaning to each of the following questions

Less is known about the cause of the common cold than about the causes of many more serious diseases

The causes of less serious diseases than the common cold are better known than it is

We know less than we should about the causes of the common cold and more serious diseases

We know less about the cause of the common cold than we do about the causes of more serious diseases

The cause of the common cold is better known than the causes of more serious diseases

Giải thích

Đáp án C

Câu gốc: Hiểu biết về nguyên nhân của bệnh cảm thông thường ít hơn về nguyên nhân của các bệnh nghiêm trọng. -> đáp án C: chúng ta biết ít về nguyên nhân bệnh cảm thường hơn là nguyên nhân các bệnh nghiêm trọng