下列反射活动中，人类所特有的是（    ）

一个四面体的四个顶点在空间直角坐标系O-xyz中的坐标分别是（0，0，0），（1，2，0），（0，2，2），（3，0，1），则该四面体中以yoz平面为投影面的正视图的面积为(      )

    Mike always loves ships. When he was older, he said, “I'm going to be a soldier.” But his eyes were not very1and he did not get in.

    Then he said, “I'm going to2a small boat and I'm going around the world.” But boats were very expensive, and Mike did not have enough3

    Last summer Mike found a swimming4near his house. The lessons did not cost very5 and Mike began going to the school at every end of the week and having6. Now he is a good swimmer.

    Last week a little boy said to him, “You're a very good swimmer. How do7learn to swim so well?”

    “I'm not good at all,” Mike said and he smiled. “8 I'm in the water, I say to myself, “There are 9fishes behind me!” Then I'm very afraid, and I10quickly.”

1993年的“汪辜会谈”是关于什么问题的（   ）

____是世界上拥有牛最多的国家。