安全防护膜
参考答案：
一般采用高强度玻璃或高强透明有机材料，要求强度高韧性好，吸收绝大部分的冲击能，保证弹体不得穿透该层。
—Isn't that Ann's husband over there?
—No, it ______ him. I'm sure he doesn't wear glasses. [ ]
A. is
B. isn't
C. are
D. wasn't
