选词填空

You may think there is nothing but sand in the desert of the world, but it is not true. In the desert we can____ stones. We can see hills, too. There is a little rain in the ____  , but it is not____  for most plants.
　　The animals are ____ to the desert people in many ways. The desert people eat the meat and drink the milk of the animals. They use their skins to ____ shoes, water bags and even tents(帐篷). They use the camels(骆驼) for____  things.
The people of the desert have to keep ____  from places to place. They must always look for grass or desert plants for their animals. They usually live in the tents. When there is mo more food for their animals, they take down their tents, put them on the camels and move to ____ place. The desert people are very____ . No man in the desert would ever refuse to help the people in ____  and give them food and water

注意：⒈可适当增加细节使行文连贯；

⒉字数100左右；

⒊开头已给出，不计入总字数；

⒋参考词汇：计划生育family program独生子女the only child

Dear Mike,

    Thank you for your letter and the photo of your family.

Yours

Li Hua

除去下列物质中含有的少量杂质（括号内的物质），所选试剂不合理的是（　　）