我国卫生部3月1日正式发布公告，撤销食品添加剂过氧化苯甲酰(C14H10O4)、过氧化钙，自2011年5月1日起禁止在面粉生产中添加这两种物质，下列关于面粉增白剂的说法正确的是 [ ]
A．过氧化苯甲酰是由14个碳原子、10个氢原子和4个氧原子构成。
B．过氧化苯甲酰分子是由C、H、O三种元素构成
C．过氧化苯甲酰中氧元素的质量分数是26.4%
D．在面粉中添加过量的增白剂无任何危害
答案：C
| 阅读理解。 | ||||
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| 1. The volunteers can ______ in the community. | ||||
| A. clean up the houses B. build a house for the homeless C. look after pet animals D. help the people who are poor | ||||
| 2. Biosphere Expedition is likely to be held ______. | ||||
| A. for three months B. in the summer holiday C. only by local scientists D. between America and China | ||||
| 3. If Wu Dong is ______ years old, he can be a volunteer to help the little kids. | ||||
| A. 11 B. 13 C. 15 D. 17 | ||||
| 4. Which of the following is TRUE? | ||||
| A. The volunteer should create green areas for all the families. B. To join the holiday volunteer work, special skills are required. C. The volunteer can choose any service activity in the community. D. The student who doesn't study at school can be a volunteer to help the little kids. | ||||
| 5. What is the best tide for this passage? | ||||
| A. A Job Interview B. Volunteers Wanted C. Education Service D. An Expedition Club |
