单项选择题A.Because people might have to migrate there someday.B.Because it is very much like the earth.C.Because it is easier to explore than other planets.D.Because its atmosphere is different from that of the earth.
单项选择题A.The root of Jim’s health problems.B.The woman’s problems with her workaholic professor.C.Jim’s relationship with his professor.D.Problems that Jim and the woman have with their workloads.