—I think teenagers should be allowed to make their own decisions when they have problems at school.
—_______. They're not calm enough, after all.
A:I agree
B:I disagree
C:I think so
D:I'm sure
在德国和日本,随处可见厂房和大楼房顶的黑色“硅板”,这就是太阳能屋顶.在风和日丽的白天,“屋顶”将太阳能转化为电能,把富余的电能送入电网.上海世博会的主题是“城市,让生活更美好”,我国有关专家指出:上海没有油田和煤矿,但有两亿平方米的屋顶,不能辜负了屋顶上这片免费的阳光.上海的年平均太阳辐射量高于德国和日本,是因为( )