哪项可确诊先天愚型（）
A.骨骼X线检查
B.血清T3、T4测定
C.染色体核型分析
D.心脏超声检查
E.智力测定
参考答案：C
I some clothes to charity because they were too small for me. [ ]
A. gave out
B. gave away
C. gave off
D. gave up
下列分子的结构中，原子的最外层电子不能都满足8电子稳定结构的是（ ）
A．CO2
B．PCl3
C．CCl4
D．NO2
