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美国医学物理学家学会（AAPM）规定X、E射线校正剂量的稳定性每年监测的允许精度为（）

A.±1%

B.±2%

C.±3%

D.±4%

E.±5%

答案

参考答案：B

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2012年5月18日，首届黄河三角洲湿地槐花节盛大开幕。位于黄河尾闾的孤岛镇万亩槐花盛开，银白无暇，绿浪浮动，蜂蝶飞舞，百里飘香。请分析回答下列问题：

（1）“风儿软软吹，槐花串串开”，从花的着生方式看，槐花为__________；“千树万树槐花开，招引蜜蜂采蜜来”，槐花属于虫媒花，在结构上适于招引昆虫的特点为______________________________。

（2）槐树的果实是狭长的荚果（上图），内含多粒种子，这是因为每朵槐花的子房里生有______________。

（3）槐花丛中，成群结队的蜜蜂翩然飞舞，繁忙的在花间采集花蜜。蜜蜂采蜜属于_____________行为。

（4）蜜蜂是完全变态发育的昆虫，它的发育过程要经过____________阶段。蜜蜂属于节肢动物，节肢动物的主要特征为_____________________。

（5）槐花蜜水白透明、蜜质浓稠、清淡幽香，富含维生素和氨基酸，是蜂蜜中的上品。

某同学想知道槐花蜜中是否含有维生素C，请你帮助他完成实验设计：

①取甲、乙两支洁净的试管，各注入2毫升_______________溶液。

②用滴管向甲试管中滴入稀释后的槐花蜜，向乙试管中滴入_______________，边滴加边振荡，注意观察试管中溶液颜色的变化。

③若甲试管中的溶液颜色褪去或比乙试管中溶液颜色变浅，则说明槐花蜜中含有维生素C。
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选用下列短语并用其正确形式填空。
learn from, give up, take place, at times, a couple of, as for, divide…into,
even though, as a result, for example, cut down, die out, in public
1. The traffic accident ________ when they were passing the corner of the street.
2. He won't leave the TV set _________ supper's on the table.
3. Hong Zhanhui is really a kind ma, we should _____him.
4. There are too many students here, so I ____ them ____ six groups.
5. The doctor told him that he may take some fruits, ________ apples, bananas and oranges.
6. We are going to _______ those trees, because they made the vegetables stop growing.
7. Many animals are nearly ______, so we should protect them.
8. Li Dong doesn't like to speak __________.
9. He said he would __________ the chance to study abroad.
10. They usually have lunch at a restaurant, but they have their lunch at home __________.
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