[填空题]When you were six years old,you had 20 teeth.These are called milk-teeth.After you are six,your milk-teeth begin to (11) .They’re making way for a new (12) .As new teeth comein,they cut off the (13) supply to the milk-teeth.After a while,the milk-teeth fall out.By the time you are 25,you should have a whole new set of teeth.And you’ll have 12 (14) teeth.In all,you’ll have (15) teeth in each jaw.When you were six years old,you had 20 teeth.These are called milk-teeth.After you are six,your milk-teeth begin to (11) .They’re making way for a new (12) .As new teeth comein,they cut off the (13) supply to the milk-teeth.After a while,the milk-teeth fall out.By the time you are 25,you should have a whole new set of teeth.And you’ll have 12 (14) teeth.In all,you’ll have (15) teeth in each jaw.

[填空题]When you were six years old,you had 20 teeth.These are called milk-teeth.After you are six,your milk-teeth begin to (11) .They’re making way for a new (12) .As new teeth comein,they cut off the (13) supply to the milk-teeth.After a while,the milk-teeth fall out.By the time you are 25,you should have a whole new set of teeth.And you’ll have 12 (14) teeth.In all,you’ll have (15) teeth in each jaw.When you were six years old,you had 20 teeth.These are called milk-teeth.After you are six,your milk-teeth begin to (11) .They’re making way for a new (12) .As new teeth comein,they cut off the (13) supply to the milk-teeth.After a while,the milk-teeth fall out.By the time you are 25,you should have a whole new set of teeth.And you’ll have 12 (14) teeth.In all,you’ll have (15) teeth in each jaw.

[单项选择]Do you remember all those years when scientists argued that smoking would kill us but the doubters insisted that we didn’’t know for sure That the evidence was inconclusive, the science uncertain That the antismoking lobby was out to destroy our way of life and the government should stay out of the way Lots of Americans bought that nonsense, and over three decades, some 10 million smokers went to early graves. There are upsetting parallels today, as scientists in one wave after another try to awaken us to the growing threat of global warming. The latest was a panel from the National Academy of Sciences, enlisted by the White House, to tell us that the Earth’’s atmosphere is definitely warming and that the problem is largely man-made. The clear message is that we should get moving to protect ourselves. The president of the National Academy, Bruce Alberts, added this key point in the preface to the panel’’s report: "Science never has all the answers. But science does provide us wit
A. there was no scientific evidence of the correlation between smoking and death.
B. the number of early deaths of smokers in the past decades was insignificant.
C. people had the freedom to choose their own way of life.
D. antismoking people were usually talking nonsense.