问题
单项选择题
氟化胺的特点不包括（）。
A．典型的表面活性剂
B．有金属味
C．可增加牙釉质的氟摄取和沉积
D．增强釉质的抗酸能力并促进早期龋损的再矿化
E．毒性低
答案
参考答案：B
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氟化胺的特点不包括（）。
A．典型的表面活性剂
B．有金属味
C．可增加牙釉质的氟摄取和沉积
D．增强釉质的抗酸能力并促进早期龋损的再矿化
E．毒性低
参考答案：B
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| Many scientists say that the world is getting hotter and hotter. If they are right, the ice at the North and South Pole will melt eventually. If this happens, the sea will 1 and may cover most 2 all of Singapore. This will force everybody to move to a 3 country. We know that the sun 4 the earth. The heat from the sun hits the 5 , and some of 6 goes back into the sky. However, factories and cars 7 a lot of carbon dioxide (二氧化碳). When the gas rises into the sky, the heat from the sun can come 8 them but the heat from the ground cannot. It 9 near us in the sky and makes the 10 hotter and hotter every year. Scientists call this the "greenhouse effect" because a greenhouse is a small glass 11 which is hot inside. It is used for 12 plants in cool countries. Many countries are 13 about the greenhouse effect. They are trying to stop factories and cars from sending 14 gases into the sky. Scientists are not sure when the world will get much hotter. Some people say that the greenhouse effect has 15 already and has begun to affect the world's weather. | ||||
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