右心衰一般最早出现的体征是（）
A.身体下垂部水肿
B.咳嗽咳痰咯血
C.颈静脉充盈或怒张
D.劳力性呼吸困难
E.肝大
参考答案：C
I was ________ by the salesman whose products turned out to be much less effective.
A．taken up
B．taken in
C．taken down
D．taken out
词义的模糊性
