地球上七大洲的总面积约为149480000km2，这一面积保留三个有效数字后得到的近似数为（ ）km2。
1.49×108
With a lot of problems ____, the manager had a hard time. [ ]
A. to settle
B. settled
C. having settled
D settling
毛制其他针织或钩编织物
