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问题 单项选择题

梅毒的病原微生物为()

A．人类 * * 瘤病毒

B．苍白螺旋体

C．沙眼衣原体

D．梅毒杆菌

答案

参考答案：B

填空题

正确认识相关事物的相同点与不同点，是学好化学的关键之一．我们可用如图所示来表示事物的异同点．将两种事物相同点写在两个圆重叠的区域内，每种事物的不同点则写在相应圆中重叠区域以外的部分．请参照图左侧示例，另外确定一组化学事物，填写在右侧空格中．
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词语填空
用所给单词的适当形式填空.
order　be　watch　away　close　manner　who　where　unless　but
     It is good __1__ for an Arab to stand __2__ to his friend when they are talking __3__ English people
do not like to __4__ too close to one another __5__ there is a reason. It could be very interesting to
__6__ an Arab and an Englishman talking together. The Arab __7__ is friendly will stand close to his
friend, but the Englishman will move back in __8__ to keep a certain distance __9__.When they finish their
talk, the two may be quite a distance away from the place __10__ they were standing.
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