衣服、餐具上的油污可以用加入洗涤剂的水洗掉，是因为洗涤剂具有 _________ 的功能，它能使植物油 _________ 而不 _________ ．

Directions:

Tom, a friend of yours, would like to visit your part of China. Write a letter to give him advice about the following subjects:

When and how to travel; what to bring; how long to stay; weather; health and medicine; which places to visit; what to buy.

You should write about 100 words on ANSWER SHEET 2. Do not sign your own name at the end of the letter. Use "Li Ming" instead. Do not write the address.