Every object has weight. But the center of its weight is not always in the middle of the object. If the top of an object is heavier than its bottom, it will fall over easily. We say that its center of gravity is high. But if the bottom is heavier, it won't fall easily. Then we say that its center of gravity is low.
    Look at the first picture. This empty box must fall over, because its center of gravity (C) is not above the line of its bottom (AB).
Now look at the second picture. There is some heavy iron in the bottom of this box. It will not fall, because its center of gravity is above its bottom.

①直到今天我们仍在享受第二次工业革命的成果

②德国和美国曾把工业文明引向更高的发展阶段

③经济领域的全球化已极大地改善了人们的生活

④近代以来中国人崇洋媚外的思想余毒仍未肃清

下图可能得出我国人口方面的结论是（    ）

看拼音，写词语。