A. MUCH B. MORE C. TOO D. VERY(46-50). READ THE PASSAGE BELOW CARE...

45. a. much

b. more

c. too

d. very

(46-50). Read the passage below carefully and choose the correct answer a, b, c or d.

In most animals, dental decay is a rare problem. In man, and especially in the rich West,

the disease has reached epidemic proportions.

The cause of tooth decay in human beings is a bacterium that feeds on the sugar in our

food. It digests the sugar more easily by converting it into an acid. The acid then

dissolves the enamel, the outer coating of the teeth, and finally attacks the living nerve

within. The result is the extreme pain we know as toothache.

– epidemic proportions (n) nạn dịch

– digest (v) tiêu hóa

– convert (sth into sth) (v) chuyển hoá (… thành …)