Mr. Zhang and Mr. Wang work in the same office. They're good friends.Mr. Zhang says to Mr. Wang in the office,“I would like to have a small party in my home on Sunday evening. Would you and your wife like to come?”

    Mr. Wang says,“Thanks a lot. I'd like to. Let me tell my wife about it.”So Mr. Wang goes to the other office and calls his wife. About half an hour later, he comes back and looks very worried.

    “What's up?” asks Mr. Zhang,“Is your wife at home?”

    “No,” says Mr. Wang.“She isn't at home now , but my little daughter is in .My little daughter says her mother goes out to look for her.”

我国面积最大的淡水湖是（  ）

近年来，许多国家都十分重视对南极洲的考察，为了尽可能保护南极这片净土，人类在南极地区的合理活动是（  ）