羊膜腔穿刺诊断染色体病的最佳时间是（）
A.孕中期任何时间
B.孕周
C.孕14周
D.孕妇16～20周
E.孕24周
参考答案：D
A person is said to be unreliable if what he does is _______ what he says. [ ]
A. on the contrary to
B. contradictory to
C. appropriate to
D. appealing to
