金属脚手架
参考答案：
采用金属材料制作、组装的脚手架。按其所用材料可分为钢管脚手架、型钢脚手架、低合金钢管脚手架和铝合金脚手架。
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'
在所有的麻疹并发症中，以下选项中远期出现的罕见的危害严重的疾病的是（）
A.肺炎
B.喉炎
C.中耳炎
D.亚急性硬化性全脑炎
E.心肌炎
