踝关节韧带断裂的固定时间为（）
A.1～2周
B.2～3周
C.3～4周
D.4～6周
E.6～8周
参考答案：D
---We’ve seen many more days of blue skies recently.
---True. But back in 1998, ________ Beijing started its “Defending the Blue Sky” program, the city only ________ about 100 days a year.
A．which, sees
B．that, saw
C．when, saw
D．and, seeing
下列属于所在国居民的是( )。
A．世界贸易组织 B．移民C．外交使节 D．驻外军事人员
