任务型阅读

　阅读短文，并按要求完成下列句子。

C

　　　　We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another place at a certain time. They move for different reasons: most of them move to find food more easily, but others move to get away from places that are too crowded.

　　　　When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration is probably the migration of the fish which is called “salmon” (鲑鱼). This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.

　　　Recently, scientists have studied the migration of a kind of lobster (龙虾). Every year, when the season of the bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where they go. So, sometimes we know why humans and animals move from one place to another place, but at other times we don't. Maybe living things just like to travel.

我国公民享有广泛的政治权利，“微博问政”需要广大公民的积极参与，我们应当（  ）
①关心国家大事，积极参与政治生活
②自觉依法行使建议权和监督权
③听说国家管理中有不公正行为，马上在微博中发表
④发现国家工作人员有违法犯罪行为，及时举报