先天愚型最有诊断价值的是（）
A.骨骼X线检查
B.染色体检查
C.血清T3、T4检查
D.智力低下
E.特殊面容，贯通手
参考答案：B
David his friend’s invitation to the picnic in order to stay at home and study for the test.
A. expected B. refused C. received
未婚同居违法吗？需要补办结婚登记手续吗？
