题干
The survey shows that if people cannot afford____ house, they will feel less content about ___life．
A：the; the
B：a; /
C：a; the
D：/; the
答案(点此获取答案解析）
B
A：the; the
B：a; /
C：a; the
D：/; the
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。分别取样:①用pH计测试,溶液显弱酸性;
