写出下列词语的近义词。

盘旋---____        修筑---____            坚固---____

陡峭---____        平整---____            瞭望---____

生物学基础研究成果已应用到医药、农药等领域．下列叙述中，符合这种情况的是（　　）

①根据DNA分子的特异性，进行亲子鉴定；

②基于细胞呼吸的原理，采用套种、合理密植、大棚种植等措施增加作物产量；

③在细胞膜的功能研究基础上，开发人工“肾”治疗尿毒症；

④根据染色体变异原理，培育出三倍体无子西瓜．

形近字组词

钩____    沟____ 

悄____      消____

下列关于植物体内物质运输的说法中正确的是（　　）

 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.