试述重新构建国际金融体系的具体措施。
参考答案：
I just don’t understand ________ that prevents so many children at school from being as happy as one might expect.
A．what it is
B．what it does
C．what is it
D．why is it
钢丝绳穿绕滑车或卷筒时，其最小直径应为钢丝绳直径的（）倍。
A、14-18
B、14-20
C、16-24
