题目

The growing speed of a plant is influenced by a number of factors, _____ are beyond our control. most of them B. most of which C. most of what D. most of that 答案：B 解析: 略 　　化简: 1-sin4α+cot( 　　 　　 　　　　3π 　　 　　 　　　　 　　 　　 　　　　4