《宋史》记载“……有造突火枪，内安子窠，如燃放，焰绝然后子窠发出，如炮声，远闻五十余步。”它描绘的是我国“四大发明”中哪一项的应用？（   ）

心理学家曾做过一个有趣实验：一个人单独骑车时，平均时速为每小时25公里；和他人竞赛时，平均时速为每小时32.5公里。由此，我们的感悟是（）
①竞争能让我们提高效率，充满活力 ②竞争的结果必然是有输有赢
③要学会感谢对手 ④我们要敢于竞争、勇于竞争

As result, I was late for school. ____ 

根据短文理解，选择正确答案。

Down by the salley gardens

my love and I did meet;

She passed the salley gardens

with little snow-white feet.

She bid (请求) me take love easy,

as the leaves grow on the tree;

But I, being young and foolish(傻的),

with her would not agree.

In a field by the river

my love and I did stand,

And on my leaning shoulder(肩膀)

she put her snow-white ______.

She bid me take life easy,

as the grass grows on the weirs(河堰);

But I was young and foolish,

and now am full of tears(眼泪).