题目内容
—Would you like to go for a walk with me, Allen?
—I’d love to, ________ you don’t want to go alone.
A. until B. before C. if D. after
C
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—Would you like to go for a walk with me, Allen?
—I’d love to, ________ you don’t want to go alone.
A. until B. before C. if D. after
C
阅读快车系列答案
A desert is a very dry land where there is hardly any rain. In the day, it can be so hot that you could fry an egg on the ground. But during the night it is sometimes so cold that water would turn into ice. 
Sometimes it does not rain for a whole year in the desert. But there is water deep under the ground and some plants have roots that go very deep to find it. Other plants have roots that spread out（延伸） a long way so they can suck up the rain as soon as it falls.
Camels are a bit like cactus plants! They store water too—inside their bodies. They have special fur which protects them from the sun during the day and keeps them warm at night. 
Some other animals live in deserts, too. They have to be very good at seeing and hearing because most of them only come out at night. This is why many desert animals have extra big eyes or ears.
A desert fox has bigger ears than a normal fox. A gerbil has huge eyes, so that it can see at night. It stays cool in the day by staying underground, like most desert animals.
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