利用蝌蚪进行甲状腺激素的探究实验,具体操作见下表:

组　别	甲	乙	丙
处理方法	不做任何处理	破坏蝌蚪的甲状腺	水中加入甲状腺激素
实验结果	正常发育	停止发育	提前发育

乙组后来加入甲状腺激素,结果又能继续发育。依据实验判断,正确的是(　　)

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.

1814年，一位意大利爱国者写道：“我这样说是痛苦的，……我们应向拿破仑致谢，但是看到法国人离开时还是有一种巨大的、说不出的欢乐。”这样说的原因是（   ）

One _____ needed when making a cake is flour; another is sugar.

下图为京津冀交通建设规划两个“时间圈”示意图。读图回答问题。