15.
C。介词as表示“作为”,为正确选项。
H
You may think
there is only sand in the desert of the world, __1__ it is not true. In
the desert, as we know, there is a little __2__, but it is not __3__
for most plants. Still we can see some plants __4__ in the desert.
There is __5__
in some places in the desert. We __6__ these places oases. In the oases,
there are villages and towns. People grow __7__ kinds of crops in the
fields there.
People __8__
live outside the oases. They have camels, sheep and other animals. These
animals depend __9__ the desert plants for their food and do not need __10__
water.
The __11__
are useful to the desert people in many ways. They eat the meat and drink the
milk of the animals. They use the camels for carrying water, food, tents and something
else.
The people of
the desert have to keep moving from place to place. They must always look 12 grass or desert plants for
their animals. When there is no more food for their animals, they move to __13__
place. The desert people are __14__. No man in the desert would ever
refuse __15__ the people in trouble and give them food and water.