覆膜的主要作用是装饰、抗磨、保护，所用的薄膜分为（）和（）。
参考答案：光膜；哑膜
The comments the expert made _____ stock market bothered Bill greatly, _____ him sleepless all night.[ ]
A. concerning; making
B. be concerning; which made
C. concerned; made
D. to be concerning; made
画一个正六边形，然后用剪刀剪成形状相同的四块，再把它们拼成1个长方形．
