可用磁选方法回收的垃圾组分为（）。
A.废纸
B.塑料
C.钢铁
D.玻璃
参考答案：C
—After the earthquake in Japan, more than one thousand Japanese children lost their parents.
—________ terrible earthquake it was! [ ]
A. How
B. what
C. what a
D. what an
