It is important to know about the cultural differences that______ cause problems．

Opposite the old town is the 5500 meters Yulong Xueshan Mountain, its peak_______ with snow.

My mother hopes _______ her do some housework first.

单词辩音。从下列四个选项中选出一个划线部分发音与其他三个不同的选项。1.

People along the river didn’t allow them to ______ a factory so as not to pollute the water.