修正的美式期权又称百慕大期权或大西洋期权，可以在期权到期日之前的一系列规定日期执行。( )
参考答案：对
—We’ll have a hiking trip, but when shall we meet?
—Let’s make it ___ half past eight ___ the morning of June 1.
A．at; in
B．at; on
C．/; in
D．about; by
哪些属半透异物（）
A.钢
B.铝
C.矿砂
D.石片
E.玻璃屑
