三衢道中

（宋代）曾几

梅子黄时日日晴，小溪泛尽却山行。

绿阴不减来时路，添得黄鹂四五声。

a将高锰酸钾装入试管，用带导管的橡皮塞塞紧试管口，并把它固定在铁架台上；

b检查装置的气密性；

c点燃酒精灯给试管加热；

d用排水法收集氧气；

e熄灭酒精灯；

f将导气管从水中取出．

正确的操作顺序是（   ）

世界人口分布是不均匀的，但又具有一定的规律性。读下图，回答问题。

    Mike always loves ships. When he was older, he said, “I'm going to be a soldier.” But his eyes were not very1and he did not get in.

    Then he said, “I'm going to2a small boat and I'm going around the world.” But boats were very expensive, and Mike did not have enough3

    Last summer Mike found a swimming4near his house. The lessons did not cost very5 and Mike began going to the school at every end of the week and having6. Now he is a good swimmer.

    Last week a little boy said to him, “You're a very good swimmer. How do7learn to swim so well?”

    “I'm not good at all,” Mike said and he smiled. “8 I'm in the water, I say to myself, “There are 9fishes behind me!” Then I'm very afraid, and I10quickly.”