斯塔夫里阿诺斯在《全球通史》中写道:“直到1500年前后各种族集团之间才第一次有了直接的交往,他们才始终联系在一起。”把世界开始连成一个整体的事件是( )
A:郑和下西洋
B:新航路开辟
C:工业革命
D:殖民扩张
读太阳光照图(阴影部分为黑夜),回答下列各题。
A: Can I help you?
B: Yes. The green scarf is very pretty. How much is it?
A: It's $100.
B: It's too expensive. What about the sunglasses?
A: They're $20.
B: They're cheap. I like them.