纺织纤维种类很多，可分为（）。
A.天然纤维和化学纤维
B.天然纤维和合成纤维。
C.矿物纤维
D.再生纤维
参考答案：A
船舶两舷应根据需要决定是否设护舷材。
35．_____ she was sick, I was expected to take her place greatly surprised me, for I didn't have much work experience.
A．That if
B．That
C．That whether
D．If
