已知复数z=1+2i（i是虚数单位），则|z|=______．
复数z=1+2i（i是虚数单位），则|z|=12+22=5．
故答案为：5．
法国最大港口、欧洲第二大油港是波尔多，它是巴黎的外港。 ( )
One reason for the successes of Asian immigrants in the U.S. is that they have taken great() to educate their children.
A. efforts
B. pains
C. attempts
D. endeavours
