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'

关于睾丸的下列说法哪种正确

A．睾丸白膜由坚韧的结缔组织层构成

B．睾丸白膜背侧增厚形成睾丸纵隔

C．从睾丸纵隔发出许多小隔以分割睾丸实质，形成睾丸小叶

D．小叶内充满曲细精管

E．以上均正确