疟疾是由下述哪种虫媒叮咬传播疟原虫引起的寄生虫病（）.
A.库蚊
B.伊蚊
C.蜱
D.按蚊
E.白蛉
参考答案：D
The Yellow River is the second _____________river in our country.
A．long
B．longer
C．longest
D．the longest
