What do you read when you travelling by train? What about other passengers? Perhaps a woman____(sit) near you is reading a romantic novel. A man is reading a serious biography about a politician. And there's a student reading an English textbook.

    What do their____(choice) say about them? Do you judge them by____they reading? I have to tell you that your impressions of them may be____(complete) wrong. The woman reading the romantic novel could be a ____(law). She just wants a light read to take her mind off work. The man reading the biography wants you____(consider) him knowledgeable, and he is just ____(show)off. The student reading the textbook isn't a student at all. She's an English teacher.

    Publishers know people are ____ (concern)about what they read on public transport and put out different versions (版本) of a cover For example, books about Harry Potter have an____ (interest)cover for young readers and then another more serious version for adults.

    So next time you see what other people are reading on a train don't jump to any conclusions.

    Here is a situation ____ you could say, "Don't judge a book by its cover.”

何为同学做实验来验证孟德尔提出的某一遗传规律，步骤如下：

①在4个白色乒乓球上分别钻个圆孔，各放入一块圆形磁铁（磁铁有南北两极，且同极相斥、异极相吸），磁铁南极露出球面，2个标上“A”，另2个标上“a”，代表卵细胞；

②将4个黄色乒乓球进行同样处理，不同的是磁铁北极露出球面，代表精子；

③将4个白球放入一个大篮子内不停摇动，使它们随机分布；

④边摇动篮子边将4个黄球同时放入篮子内；

⑤待看到4个白球分别与4个黄球两两结合（北铁异极相吸，如图）后，统计分析结果．

请回答问题．

解释下列词语

①贪婪    

②刹那间