问题
多项选择题
流感预测所需的资料主要包括（）。
A、当前国内外的流行动态
B、当前病毒变异的阶段及变异动向
C、当地历年的流行资料
D、当地人群的免疫水平
E、流感疫苗的免疫覆盖率
答案
参考答案：A, B, C, D
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流感预测所需的资料主要包括（）。
A、当前国内外的流行动态
B、当前病毒变异的阶段及变异动向
C、当地历年的流行资料
D、当地人群的免疫水平
E、流感疫苗的免疫覆盖率
参考答案：A, B, C, D
Big schoolbags have been a big problem for students for a long time. Maybe your schoolbag is too 1 to carry, and it troubles you a lot 2 you want to find out a book to read. Now e-textbooks will 3 you. It is said that many Chinese middle schools are going to use e-textbooks. An e-textbook, in fact, is a small 4 for students. It is much 5 than a usual schoolbag and easy to carry. Though it is as small as a book, it can 6 everything for study. The students can read the text page by page on the 7 ，take notes 8 the pointer (屏写笔)，or even “hand in” their 9 to their teachers by sending e-mails. All they have to do is to press a button (按开关). Some people say e-textbooks are good, but some say they may be 10 for the students’ eyes. What do you think of it?
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