登革热地方性流行区的当地居民易患登革出血热的原因是
A.遗传因素
B.气候因素
C.生活习惯
D.当地卫生条件差,有利于疾病传播
E.当地居民血液中有促进性抗体
参考答案:E
—Our school in 1886.
—Wa, it has a very long history.[ ]
A. built
B. was built
C. is built
D. has built
以下能够正确计算1+2+3+…+10的程序是
A.Private sub Command1_Click( ) sum=0 For 1=1 To 10 Sum=sum+1, Next I Print Sum End Sub
B.Private sub Command1_Click( ) Sum=0,I=1 Do While l<=10 Sum=Sum+1 I=I+1 Print Sum End Sub
C.Private Sub command1_click( ) Sum=0:I=1 Do Sum=Sum+1 I=I+1 Loop While I<10 Print Sum End Sub
D.Private Sub command1_Click( ) Sum=0:I=1 DoSum=Sum+1 l=I+1 Loop Until I<10 Print Sum End Sub