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问题 单项选择题

HIV感染的自然病程分为四期，正确的是（）。

A.①无症状期，②艾滋病前期，③急性期，④艾滋病期

B.①急性期，②无症状期，③艾滋病前期，④艾滋病期

C.①无症状期，②急性期，③艾滋病前期，④艾滋病期

D.①艾滋病前期，②无症状期，③急性期，④艾滋病期

E.①急性期，②艾滋病前期，③无症状期，④艾滋病期

答案

参考答案：B

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It was a winter morning, just before Christmas, while most people were warming up their cars, my husband, Trevor, had to ride his bike 4 kilometers away from home to work. On his  小题1:   (arrive), he parked his bike outside the back door  小题2:    usual. After 10 hours of labor, he returned to find his bike gone,   小题3:    was our only transport. Trevor used it to get to work, and also the bike was used  小题4:   (get) groceries, saving us from having to walk long distances from where we live. I was so sad  小题5:   I wrote to the newspaper and told them our story. Shortly after that, several people in our area offered to help. One wonderful stranger even bought a bike, and then called my husband to fetch  小题6:  . Once again my husband had a way to get to and  小题7:   his job. It really is  小题8:   honor that a complete stranger would go out of their way for someone they have never met before. People say that a smile can  小题9:  (pass) from one person to another, but acts of kindness from strangers are even more so. This experience has had a spreading effect on our lives because it 小题10:  (strong) our faith in humanity. And it has influenced us to be more mindful of ways we, too, can share with others.
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问答题 简答题

推煤机主离合器结合不上的原因是什么？如何解决？
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