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【多选题】
下面不属于条件语句的是()。A.
for
B.
if else
C.
while
D.
continue
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举一反三
【单选题】What’s the disadvantage of e-mail according to the passage?
A.
It has to many junk mails.
B.
I t has no way to know if the person has read the message immediately .
C.
It assumes that the minute someone receives an e-mail, the person will read it.
【简答题】设m，n是，证明：(2 m -1，2 n -1)=2 (m，n) =1．
【简答题】已知数列{ }满足a 1 =0，a 2 =2，且对任意m、n∈N*都有a 2m﹣1 +a 2n﹣1 =2a m+n﹣1 +2（m﹣n） 2 （1）求a 3 ，a 5 ； （2）设b n =a 2n+1 ﹣a 2n﹣1 （n∈N*），证明：{b n }是等差数列； （3）设c n =（ +1 ﹣ ）q n﹣1 （q≠0，n∈N*），求数列{c n }的前n项和S n ．
【单选题】What’s the trends showed inP4?
A.
Young people are changing in agenda.
B.
Young people cannot live without their parents.
C.
Young people needs friends.
D.
Young people are likely t shift to a new career.
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