线麻绳完全是用（）纤维为原料，其特点为柔韧，弹力大，拉力强，但韧性差，遇水易腐蚀。
A．龙舌兰麻
B．麻
C．大麻
D．尼龙
参考答案：C
阅读下图，填出图中字母代表的大洲名称。
A．_________，B．_________，C．_________，D．_________，E．_________，F．_________，G．_________。
— Did your father come back early last night?
— Yes. It was not yet eight o'clock ____ he arrived home. [ ]
A. before
B. when
C. that
D. until
