单项选择题A.concernedB.concernC.concerningD.to concern
单项选择题A.build onB.build upC.build intoD.build out
问答题这些老人养成了每天早上锻炼的习惯。
问答题学生应该在上课之前完成家庭作业。
问答题她的工作是照看这些老人。
问答题When the pressure of population on housing declines, prices also decline and the building industry is weakened.
问答题It wasn’t until the twentieth century that women’s umbrellas began to be made in a variety of colors.
问答题The advantages and disadvantages of a large population have long been a subject of discussion among economists (经济学家).
问答题But brief replies do not mean Americans are impolite of unfriendly to some extent.
问答题If people praise them or thank them in an especially polite way, they may become uncomfortable and not know what to say in reply.