下列变化中属于化学变化的是 [ ]
A．食物消化
B．玻璃破碎
C．铁杵成针
D．酒精挥发
答案：A
Uncle _____ exercises.
It's not good for his health. [ ]
A. sometimes
B. seldom
C. often
D. always
模拟法测图用的图纸目前广泛采用打毛的聚酯薄膜，其厚度为( )mm。
A．0.05～0.1 B．0.05～0.7 C．0.07～0.1 D．0.07～0.7
