单项选择题A.Employ them as lab assistants.B.Teach chemistry classes at their high school.C.Help them with their studies.D.Pay them for participating in the study.
单项选择题A.It will rise an average of 1 foot.B.It will be worn down an average of 1 foot.C.It will be worn down to sea level.D.It will lose 730 million tons of solid matter.