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                          The tooth decay
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 out foo It digests the sugar more easily by converting it into an aci The aicd then dissolves the enanel, the outer coathing of the teeth and finally attacks the living nerve within. The result is the agonizing pain we know as toothache.
 1. According to the passage how common are for animals to suffer from toith decay?
A. They never suffer from it.
B. They suffer from it more commonly than people do.
C. They seldom suffer from it.
D. They suffer from it as commonly as people do.
2. What does the passage say about the problem of tooth in the rich Western country?
A. It is now virtually out of control.
B. It is steadily decreasing each year.
C. It has remained unchanged for a long time.
D. It has been increasing slowly for year.
3. Human teeth decay when they are attacked by a kind of                 .
A.food      B.nerve        C.acid       D.sugar
4. Decay cannot begin until tge bacterium produces _____.
A.sugar from acid           B.food from sugar
C.acid from sugar            C.sugar from food
5. The last sentence mean that toothache is a condition which is often _________________.
A.quite unexpected
B.unpleasant but bearable
C.a bit unpleasant
D.unbearable