请认真阅读下列短文，并回答有关问题．

一粒“尘埃”悄悄地落在一只蟋蟀的背上，细长而闪亮的丝线从“尘埃”中伸出来，开始进入蟋蟀湿润的身体，在它们生长时，这些丝线还释放一些化合物，慢慢地溶解蟋蟀体内的组织，这些丝线还进一步深入蟋蟀的体内，数日后，这只蟋蟀成为一只塞满致命丝线的空壳，然后这些丝线开始向这只死蟋蟀体外延伸，它们长出柄，并且在顶端有结状物，一旦一个结状物裂开，就会有数千粒尘埃的微粒散发出来，风将带着它们再次去“犯罪”．

（1）文中所说的“尘埃”指的是____；“丝线”指的是____ ；“丝线”深入蟋蟀体内的目的是____．

（2）你认为使蟋蟀致死的是____ （哪类生物），该生物与蟋蟀的关系是____（填写捕食/竞争/寄生/共生）．

A

    Most Americans start to school at the age of five when they enter kindergarten(幼儿园). Children do not really study at this time. They only attend for half the day and learn what school is like. Children attend elementary school for the next six years. They learn to read and write and work with numbers. They also study the world and its people. After they leave elementary school, children go to junior high school for three years and senior high school for another three years. This is called secondary education. In some places, the children go to elementary school for eight years and high school for four. In all, elementary and secondary education together take twelve years to complete excluding （不包括）kindergarten.

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读图完成下列各题．