问题 单项选择题

百日咳杆菌的主要致病物质是()。

A.荚膜

B.内毒素

C.外毒素

D.菌毛

答案

参考答案:C

解析:

百日咳杆菌的致病物质中较为重要的是百日咳毒素。百日咳毒素为外毒素,是百日咳的主要毒力因子。

阅读理解
                               A
School Library
To Joy Lee,
Just to remind you that you have four overdue books.
Title               Writer
① The age of Innocence    Edith Wharton              due (到期) 22/Jan
② Mr Standfast            John Buchan                due        24/Jan
③ Imagine                 Alison Lester                  due        26/Jan
④ Selected Tales          Jakob and Wilhelm Grimm         due        26/Jan
Please return these books tomorrow. Other people may be waiting to borrow them.
Jane Johnes
Librarian
Date: 3/Feb/2013
Note: You may not borrow any new books until these books have been returned.
小题1: This is       .
A.a reportB.an introductionC.a reminder D.an advertisement
小题2:This note was written by       .
A.Jane JohnesB.Joy LeeC.Alison LesterD.John Buchan
小题3:John Buchan is       .
A.due on 24th JanuaryB.a friend of Joy Lee’s
C.the writer of the noteD.the writer of Mr Standfast
小题4:Joy Lee should return the book Imagine before       .
A.22ndJanB.24thJanC.26thJanD.3rdFeb
小题5: From this note we DON’T know that       .
A.Jane Johnes works in the library
B.Joy Lee may not borrow any new books now
C.Joy Lee has lent these four books to other students
D.Jane Johnes asks the note receiver to return the four books on Feb. 4th
单项选择题