近年来，世界水产品利用上分食用和非食用两部分，其中非食用部分约占（）。
A.10%
B.20%
C.30%
D.以上都不是
参考答案：C
Today we have chat rooms, text messaging, emailing… but we seem _____ the art of communicating
face-to-face. [ ]
A. losing
B. to be losing
C. to be lost
D. having lost
8.56近似于自然数9。[ ]
