溶液，胶体，浊液这三种分散系的根本区别是（  ）

——Can you tell me whom the play ______ in the 1990s?
——Sorry, I don't know.

 根据对话内容，用方框中所给单词的适当形式填空，每词限用一次。

water    no    Earth    it    for

Bill: I saw a great programme on TV about space yesterday evening.
Tony: What is ____ about?  
Bill: Scientists have discovered ____ on Mars.
Tony: Really? That's very fantastic. Have they discovered life on Mars?
Bill: Well, they're looking____  life but they haven’t found anything yet.
Tony: I know there's ____ life on the moon.
Bill: Yes, that's right. So far there's only life on ____ .
Tony: Are we alone with so many stars in the universe?
Bill: I am interested in it, so I want to be a scientist when I grow up.
Tony: I wish you will.

2016年1月1日起实施的《中华人民共和国人口与计划生育法》规定：国家提倡一对夫妻生育两个子女，这一政策的实施（    ）

①说明我国人口形势不再严峻，国家已取消计划生育的基本国策                      ②可以增强家庭抵御风险能力，促进家庭幸福与社会和谐

③可以优化人口结构，减缓人口老龄化压力，促进经济社会持续协调发展      ④是为了顺应百姓的生育愿望，会导致我国人口数量大幅度增加

下图为一枚圆形、铜质证章，该证章正面饰红彩，中部铸国民党党徽，下铸犁纹，上方铸有篆体“广东顺德县农民协会会员证章”字样。这枚证章（    ）