商品堆码应符合哪些要求

The growing speed of a plant is influenced by a number of factors, ______ are beyond our control.

A．most of them

B．most of what

C．most of which

D．most of that

Xiamen Xiang'an Tunnel, _____ is the first undersea tunnel built in mainland China, opened to traffic on April 26th．

A．that

B．what

C．where

D．which

承诺都应该以通知的方式作出并且承诺不可以撤回。（）

植物固醇广泛存在于植物的( )中，是植物细胞膜的组成部分。

A．根

B．茎

C．叶

D．果实

E．种子

西河大鼓