人体附肢骨从形状上看,多为()骨。
A.长
B.短
C.扁
D.不规则
参考答案:A
解析:附肢骨分为上肢骨和下肢骨,四肢骨共126块,其中仅手骨和足骨的长骨就80块,因而多为长骨。
下列变化中,前者是化学变化,后者是物理变化的是 [ ]
A.用海水晒盐 浓硫酸使白纸变黑
B.牛奶变酸 米酿成醋
C.矿石粉碎 食物腐烂
D.蜡烛燃烧 酒精挥发
Nowadays there are still a number of students school at various grades due to a lack of money in
some poorer areas. [ ]
A. leaving out
B. making out
C. letting out
D. dropping out