A.4:1
B.1:
C.2:1
D.:1
答案:C
The old couple were not used to _____ in the noisy city. [ ]
A. live
B. be living
C. lives
D. living
血钙减低见于()
A.多发性骨髓瘤
B.急性肾功能不全
C.骨肉瘤
D.肾病综合征
E.甲状旁腺功能亢进症