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【简答题】
设曲线 与直线 相切,则 ________
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【简答题】总和生育率是按照某一年度的妇女生育水平，计算每个妇女度过其整个生育期可能生育的子女数。下图表示1950~1996年我国总和生育率的变化情况。读图，回答下列问题。 （1）我国在20世纪60年代初总和生育率最高，它受到哪些传统观念的影响？ __________________________________________________________________________________...
【单选题】Heavy smokers risk _____ their health greatly.
A.
to damage
B.
damaging
C.
damaged
D.
damage
【简答题】China has a p______ of more than 1,300,000,000.
【单选题】总生育率指一名妇女在育龄期(15-49岁)生育婴儿的平均数。总生育率维持在【 】时，一个国家的人口就基本上保持不变。
A.
1.5
B.
2.0
C.
2.5
D.
3.0
【简答题】理论回答并解决了哪些基本问题？
【多选题】Heavy smokers and drinkers run a fifteen-times greater risk of developing cancer of the mouth and throat than nonsmokers and nondrinkers.
A.
Cancer of the mouth and throat is more likely to occur in heavy smokers and drinkers than in nonsmokers and nondrinkers.
B.
People who never drink and smoke will not get mouth or throat cancer.
C.
Heavy drinkers who run have a greater risk of developing cancer than nondrinkers.
D.
People who don't smoke and drink have less chance of getting cancer of the mouth and throat than those who smoke and drink heavily.
E.
People would probably be healthier if they did not drink and smoke too much.
【单选题】总生育率指一名妇女在育龄期(15-49岁)生育婴儿的平均数。总生育率维持在【 】时，一个国家的人口就基本上保持不变。
A.
1.5~1.6
B.
1.7~1.9
C.
2.0~2.1
D.
2.3~2.5
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