When Mary _____ the city, it began to rain. [ ]
A. got
B. reached
C. got at
D. reached at
B
已知x≥0,y≥0,x+2y=1,则u=x+y2的取值范围是______.
Eclipse重构中的重命名功能为我们解决了变量、类、____________.等重命名的所有问题。