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【简答题】
（1）是否存在正整数m，n，使得m（m+2）=n（n+1）？ （2）设k（k≥3）是给定的正整数，是否存在正整数m，n，使得m（m+k）=n（n+1）？
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举一反三
【简答题】When did Mark Twain move to Hannibal?
【单选题】--Mark broke his leg when he was playing football.--was that?
A.
Since when
B.
Since when ago
C.
How long
D.
How long ago
【简答题】Mark Twain got married when he was ______ years old.
【单选题】被称为机体抗感染“先头部队”、“主力军”和“边防军”的分别是:
A.
lgG IgA IgM
B.
IgM SIgA lIgG
C.
lgG IgM SIgA
D.
IgM IgG SIgA
【简答题】油菜的施肥原则足施足基肥,平施 苗 肥、 _________ 、 _________ 和 _________ 。
【单选题】How was the Project received when Mark first sent his invitation?
A.
Mark received responses from 53 schools.
B.
There were about 1,500 bags decorated with one announcement.
C.
It was a huge success, which, to a great extent, was due to the power of the Internet.
D.
R was a hit among the schools but the local supermarket was quite reluctant to offer their bags at first.
相关题目：
【单选题】被称为机体抗感染“先头部队”、“主力军”和“边防军”的分别是:
A.
lgG IgA IgM
B.
IgM SIgA lIgG
C.
lgG IgM SIgA
D.
IgM IgG SIgA