卫氏并殖吸虫病的主要传染源是（）
A.病猫
B.病犬
C.病禽
D.病猪
E.患者
参考答案：B
—How do you think I should receive the reporter?
—___ you feel about him, try to be polite.
A．How
B．What
C．Whatever
D．However
试述水稻晒田的作用与技术。
