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问题 单项选择题

一般不通过垂直传播的病毒是

A．脊髓灰质炎病毒
B．乙型肝炎病毒
C．人类免疫缺陷病毒
D．巨细胞病毒
E．风疹病毒

答案

参考答案：A

解析：病毒的传播途径包括水平和垂直传播。其中经胎盘或产道途径为垂直传播。脊髓灰质炎病毒通过粪口途径传播。

完形填空

New York is one of the most exciting c___小题1:___ in the world. You might want to do some shopping in New York. Fifth Avenue is probably New York’s most f____小题2:____shopping street, but if you go, be prepared to “window shop” only. This is shopping for the r___小题3:____. There are others , less expensive shopping areas nearby , and they’ll soon come a___小题4:____ famous stores such as Bloomingdales, Macy’s and FAO Schwartz.

And if you’ve brought your rollerblades(滚轮冰刀鞋) , t___小题5:____ a visit to

Central Park is a must. This is a large, open park right in the middle of Manhattan, but if you thought that people came here to r___小题6:_____, sit down for a few minutes and get a____小题7:_____ from the rush of New York life, then you’d been wrong. N____小题8:___ sits in Central Park: they run, jpg(慢跑) , and m___小题9:____ of them wear their rollerblades.

When you l___小题10:_____ New York, you might be tired, but the one thing you won’t be is bored!
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判断题

所有的类胡萝卜素都是脂溶性色素。
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