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问题 单项选择题

GVHR的特点是（）。

A．移植物的淋巴细胞与宿主的淋巴细胞相互识别、反应，但以移植物的反应占优势

B．移植物的B细胞产生大量自身抗体

C．移植物的淋巴细胞与宿主的淋巴细胞相互识别、反应，但以宿主的反应占优势

D．宿主的B细胞产生大量自身抗体

E．以上都不对

答案

参考答案：A

填空题

根据短文内容选择方框内的单词，并用其正确的形式填入空白处，使补全后的短文意思通顺，语法正确，结构完整。

I think it is easy to live a low carbon life if you want to make our life better. Here are some _____小题1:____ of advice: Travel by bus, bike or on foot as much as possible and ask our parents to drive as little as possible.

Plant trees as many as you can. Trees can help to make the air cooler in summer. ___小题2:____ the lights if it isn’t necessary to keep them on.

Don’t waste the water, oil, _____小题3:___ etc. Of course, there are many __小题4:______ things we can do in our daily life. After all, the earth is our common home. If everyone _____小题5:____ small changes, we can make a difference.
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单项选择题

罗红霉素的化学结构与下列哪个药物相类似？（）

A．克林霉素

B．氯霉素

C．红霉素

D．阿米卡星

E．多西环素
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