棉纤维的横截面主要由()等部分组成。
A、初生层
B、次生层
C、果胶层
D、中腔
参考答案:A, B, D
English became the official language for business __ the fact that the population was largely Chinese. [ ]
A. in place of
B. in spite of
C. in case of
D. in favor of
莫尔