下列表述属于食物链的是（　　）

字扩词

涂：____　____　____　　

舒：____　____　____

余：____　____　____　　　

卡：____　____　____

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处

填入一个适当的词或使用括号中词语的正确形式填空。

    All ____ (student)need to have good habits：When you have good study habits, you learn things ____ (quick). You also remember____ (they) easily.

    Do you like to study in the ____ (live) room? This is not a good place ____ it is usually too noisy. You need to study ____ a quiet place，like your bedroom. A quiet place will help you only ____ (thought)about one thing，and you will learn better.

     Before you begin to study, don't forget ____ (clean) your desk. A good desk light is ____ (importance), too. You'll feel tired easily if there ____ (be) not enough light.

下列化合物中，经过烯烃复分解反应可以生成 的是（   ）