有人说：“夏娃的苹果让人有了道德，牛顿的苹果让人有了科学，而乔布斯的苹果让人有了生活。”牛顿获得如此赞美，是因为他（    ）

根据课文《识字5》组词。

斤____      折____      挑____     根____ 

独____      满____      容____      易____ 

对燕麦胚芽鞘作如下图处理：

①放在暗盒里             ②胚芽鞘尖端的下部用锡箔遮住 
③在尖端横向插入云母片   ④在尖端横向插入琼脂片 
⑤切去胚芽鞘尖端    ⑥切去尖端，在切口上放置一含有一定浓度生长素的琼脂小块
⑦切去尖端，在切口上放一含有一定浓度的生长素琼脂小块，并放在暗盒里
⑧切去尖端，放在暗盒里．
以下都给予单侧光照射其中仍能直立生长的是

根据短文内容的理解，选择正确答案。   

    This is Jim. He is thirteen. He is from the USA. He is a student. He has a good friend. His name is Jack. Jack is fifteen. He is from Canada. Jack is tall but Jim is short. They are in the same class, but they are in different grades. Jim is in Class Two. Jack is in Class Two, too. They go to school(上学) at seven in the morning and go home(回家) at six in the afternoon.

下列现象中的物体属于生物的是（　　）