单项选择题A.By sending water directly back to the sea with great force.B.By reducing wave energy.C.By reducing beach width.D.By stabilizing beachfront construction.
单项选择题A.It’s now taught with the aid of computers.B.It isn’t considered as important today as it was in the past.C.Children today learn it earlier than those did in the past.D.A lot of time is spent teaching it.