①密闭程度较高 ②高大宽敞，通风透气性好 ③墙体较厚 ④许多民居有两层窗户

A. ①②③ B. ①②④ C. ①③④ D. ②③④

【题目】假如要给地球缝制一件外衣，那么所需要的布料应该是（ ）
A.5.1亿平方千米
B.5.1亿千米
C.5.1亿立方千米
D.5.1平方千米

【题目】The charity began providing _____ food and water for _____ people in the earthquake area.
A.to provide; to
B.providing; for
C.to provide; with
D.providing; with

【题目】Miss Zhang can ______a lot of good ways _____ the problem.
A.come out with, to solve
B.come up with, to solve
C.work out, to solve
D.come up with, to answer

【题目】为了保护与和平利用地球上最后一片净土──南极地区，下面做法，哪一项是正确的（　　）
A.大建居民点，向南极地区大量移民
B.大力开采南极地区的矿产资源
C.大规模捕鲸、企鹅
D.各国加强合作，履行《南极条约》

【题目】Lucy _____ her kind mother and she often helps _____ sick kids in the hospital.
A.takes after, take care of
B.looks after, takes care of
C.takes care of, take after
D.takes after, looks after