完形填空
    Space travel 1 exciting, doesn't it? Now if you have enough money, you can go to space to see our2.You can stay in space for a few days and 3some special food which is for astronauts.
    In the future, space travel may be more 4. People can travel in space and reach other 5. Today, if you want to go to Mars(火星), how 6do you think it will take? That will be a long trip. Even in the best spaceship, it will7 about one year.
    In the 8, that will not be a problem. Spaceships can travel very 9 Perhaps we 10 use the spaceships at all. We may 11 the wormhole(虫洞）。It is like a tunnel(隧道). Once we get 12 the tunnel, we will arrive at another place far away from the earth. It may take just a few 13.
    14develops(发展)very fast. We believe that one day in the future, the dream of traveling from one star to another will 15.

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比较实数：2、 $\sqrt{5}$ 、 $\sqrt[3]{7}$ 的大小，正确的是（   ）

用酵母菌制作面包的过程大致为：将面粉、糖、酵母菌和水混合成生面团，一段时间后，将生面团放入烤箱中烘烤．

四大洋中，平均水温最低的是