我国目前已经形成了一个全方位、多层次、宽领域的对外开放格局。( )
参考答案：对
Her father gave her the ___ of going on to college or starting to work.
A．chance
B．opportunity
C．alternative
D．possibility
下列铝合金中（）属于热处理强化铝合金。
A、铝镁合金
B、硬铝合金
C、铝硅合金
D、超硬铝合金
