有人认为：传染病预防的主要措施有：（1）控制传染源，（2）切断_爱下问搜题

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问题单项选择题

有人认为：传染病预防的主要措施有：（1）控制传染源，（2）切断传播途径（3）保护易感人群。你认为是（）

A.同意此人观点

B.只需要控制传染源

C.只需要切断传播途径

D.只需要保护易感人群

答案

参考答案：A

填空题

已知a＞b＞0，全集I=R，M={x|b＜x＜

≤x≤a}，则M∩N=______．

完形填空

Having said good-bye to his parents, Alvin, with his wife and one-year-old son, set off back home. Still    , Alvin and Clare talked and laughed happily. And even little Alex    from time to time. The family were     their trip.
But about three hours later things began to    . It was starting to snow. Alvin      up the car, hoping to arrive home before dark. But it was too dangerous to drive fast now, because it was snowing more and more heavily. So Alvin had to    down. The snow on the     was getting deeper and deeper until it was hard to     on it. Their car slipped (滑落) off the way and got stuck in the deep snow and the engine     to start again.
“The snow doesn’t seem to    . Shall we stay in the car waiting to be frozen to death or walk ahead through the snow?” Alvin asked. Clare said she     to walk. So they got out of the car with their son and began walking. But     was to come. Soon they lost their way and had to walk     on and on.
Night came. They were not afraid of the dark. But they     that poor Alex would die of cold. However, their faith to keep Alex     filled them with courage, warmth and strength. They __   and rested in turn and then continued their walk. They had     falls but each time true love encouraged them to rise to their feet again.
One, two, three … seven days passed. On the eighth day, help at last from Alvin’s    , the police and local people. But the young    had to have their feet cut off because of the bad frostbite (冻伤).      , there was nothing serious wrong with little Alex!

D．melt (融化)

C．Fortunately