beneath__their__stomachs．

过了一会儿她看到了一些斑马，它们身上有从上一直延伸到腹部的黑白相间的条纹。

2．They lived on the earth tens of millions of years ago，long__before__humans__came into__being and their future seemed secure at that time.

千百万年前，它们(恐龙)就在地球上生活，比人类的出现要早得多，当时他们的前景似乎很安全。

3．When scientists inspected the bones，they were surprised to find that these dinosaurs could not__only run like the others but__also climb trees.

当科学家们观察这些骨头时，惊奇地发现这些恐龙不仅像其他恐龙一样可以跑，而且还可以爬树。

4．They learned this from the__way the bones were joined together.

他们是根据恐龙骨骼的连接方式来得出这种判断的。

5．It__is__a__pity__that in the story nobody helped the dodo.

很遗憾在故事中没有人帮助渡渡鸟。

派生

(1)名词后缀：－ing，－ance

①end v．结束；终止→ending n．结局；结尾

②disappear v．消失→disappearance n．消失

(2)否定前缀：un－

expected adj.意料之中的；料到会有的→unexpected adj.没料到的；意外的

(3)形容词后缀：－y

dust n．灰尘；尘土；尘埃→dusty布满灰尘的；灰尘弥漫的

(4)副词后缀：－ly

faithful adj.忠诚的；忠实的→faithfully adv.忠诚地；忠实地