如图是反射弧结构模式图，a、b分别是放置在传出神经和骨骼肌上的电极，用于刺激神经和骨骼肌；c是放置在传出神经上的电位计，用于记录神经兴奋电位；d为神经与肌细胞接头部位，是一种突触．

完形填空
    Space travel 1 exciting, doesn't it? Now if you have enough money, you can go to space to see our2.You can stay in space for a few days and 3some special food which is for astronauts.
    In the future, space travel may be more 4. People can travel in space and reach other 5. Today, if you want to go to Mars(火星), how 6do you think it will take? That will be a long trip. Even in the best spaceship, it will7 about one year.
    In the 8, that will not be a problem. Spaceships can travel very 9 Perhaps we 10 use the spaceships at all. We may 11 the wormhole(虫洞）。It is like a tunnel(隧道). Once we get 12 the tunnel, we will arrive at another place far away from the earth. It may take just a few 13.
    14develops(发展)very fast. We believe that one day in the future, the dream of traveling from one star to another will 15.

按要求填空。

Ⅰ“屈”字在字典里的解释有：①弯曲，使弯曲；②屈服，使屈服；③理亏；④委屈，冤枉；⑤姓。将下列词语中的“屈”字的正确解释的序号填在横线上。

顽强不屈____     能屈能伸____     理屈词穷____     屈打成招____

Ⅱ“已”用音序查字法查字典，应查音序____。“已”在字典中的解释有：①已经；②后来；③停止。“赞叹不已”中的“已”应选第____种解释。

Ⅲ“固”用部首查字法，应先查部首____，再查____画；按音序查字法，应先查音序____，再查音节____。“固”在字典中的解释有：①结实；②坚定的；③本来。“人固有一死”的“固”应选第____种解释。

阅读句子并回答。

听了伯父这句话，我又羞愧，又悔恨，比挨打挨骂还难受。

①文中“这句话”指：“____”

②这句话表面在夸自己，实际上是____。

③这句话体现了____。

地球作为太阳系一颗特殊的行星，主要表现在