问题详情：
综合填空。
用适当的词完成句子，使短文意思完整。
There are 47 different kinds of Kangaroos(袋鼠). The smallest are about a quarter of a meter long. The 1 are taller than a man. Kangaroos have very long strong back 2 . These are used for 3 . They also have 4 strong tails for resting on.
Kangaroos’ front legs are 5 shorter, and are almost like arms. Kangaroos’ heads are quite small, but their ears are quite large.
【回答】
1. biggest 2. legs 3. jumping 4. long 5. much
知识点：短文填空
题型：阅读填空
