（2015·茂名）阅读下面文章，根据文章内容，从每小题所给出的A、 B、 C、 D四个选项中选出最佳答案.

Many rules govern drivers on American streets and highways. The most common ones are the speed limits(限制). The speed limits control how fast a car may go.

On streets in the city,  the speed limitis usually 25 or 35 miles per hour.On the highways between cities, the speedlimit is usually 55 miles per hour. When people drive faster than the speedlimit, a policeman can stop them. The policemen give them pieces of paper which people call traffic tickets. Traffic tickets tell the drivers how much money they must pay. When drivers receive too many tickets, they probably cannot drive for a while. 

The rush hour is when people are going to work or going home from work. At rush hour there are many cars on the streets and traffic moves very slowly. Nearly all American cities have rush hours. Drivers do not get tickets very often for speeding during the rush hours because they cannot drive fast.

依次填入下列各句横线处的词语，最恰当的一组是( )

① 随着社会的发展，教育越来越引起人们的关注。

② 书上有些比较可靠的民间歌谣，虽然不多，但很可贵。因为它是第一手的资料，纯粹的资料，不是经过的。

③ 好风景固然可以打动人心，但若得几个情投意合的人，相与其间，那才真有味儿；这时候风景觉得更好。

下列关于动物生殖发育的叙述，正确的是（   ）

用燃气灶烧水是通过____的方式改变水的内能，泡茶时满屋都可闻到茶的清香，这表明分子在不停地____．