单项选择题A.Because every engineer must work with these sciences.B.Because every engineer knows a lot of them.C.Because the two sciences are taught in every school.D.Because the two sciences are too difficult.
单项选择题A.The man has earned little money.B.The woman has earned a lot of money.C.The man has earned a lot of money.D.The man has given the woman a lot of money.