问题
单项选择题
一层立方上皮，借牙板与口腔上皮相连（）
A．外釉上皮层
B．内釉上皮层
C．星网状层
D．中间层
E．釉结
答案
参考答案：A
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一层立方上皮，借牙板与口腔上皮相连（）
A．外釉上皮层
B．内釉上皮层
C．星网状层
D．中间层
E．釉结
参考答案：A
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| Television has now come to nearly every family. It has 1 a very important part in 2 life. School children in the US watch TV about twenty-five hours 3 . Some parents think the television is good 4 their children, because it helps them to learn about their country and the world. 5 the help of some educational programmes, children do so 6 in school. 7 parents do not let their children 8 TV too much. They say that some of the TV programmes are not good and children often 9 bad things from them. Man have invented many things which have brought us much convenience (方便). Television is one of them. If it 10 carefully planned, watching TV can be good for children | ||||
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