更多"Fluoride deters tooth decay by redu"的相关试题:
[单项选择]Physicists' recent investigations of the decay of the vacuum, as described in the passage, most closely resemble which of the following hypothetical events in other disciplines
[单项选择]The dentist has decided to extract her bad tooth.
A. take out
B. repair
C. push in
D. dig
[单项选择]According to the man, why do modern books decay
A. They are often handled improperly by readers.
B. The paper is destroyed by chemicals.
C. The ink used in printing damages the paper.
D. The glue used in the binding loses its strengt
[单项选择]He went to a hospital and had his tooth （）.
A. being pulled
B. be pulled
C. to be pulled
D. pulled
[单项选择]Linda was wearing her usual sunglasses and a toothy smile．
A. 琳达戴着平常的太阳镜，上面印有露齿的笑容。
B. 琳达戴上平时的太阳镜的时候，露齿而笑。
C. 琳达戴着平时老戴的太阳镜，露齿地笑着。
D. 琳达带着笑容和太阳镜。
[单项选择]Mental decay due to aging is ______.
A. common
B. much more common than most people believe
C. much less common than most people believe
D. true of those over sixty
[单项选择]The dentist said that if my tooth (got worse) I (would have to) (have) it (pull out).
A. got worse
B. would have to
C. have
D. pull out
[单项选择]Go to your dentist before decay of the teeth ________.
A. sets in
B. sets off
C. sets on
D. sets up
[单项选择]Unless the population growth stabilizes, environmentalists predict a worldwide starvation by the next decade.
A. famine
B. shortage
C. rebellion
D. infection
[单项选择]Which of the following demographic growth pattern is most suitable for the long thin powder fuse analogy
A. A virtually stable or slightly decreasing period and then a sudden explosion of population.
B. A slow growth for a long time and then a period of rapid, dramatic increase.
C. Too many people on earth and a few rapid increase in the number added each year.
D. A long period when death rates exceeds birthrates and then a short period with higher fertility and lower mortality.
