房源的特征包括()。
A.稳定性
B.长期性
C.动态性
D.经济性
E.可替代性
参考答案:C, E
—I hear Tom ______ playing games recently.
—______ no wonder he is easy to feel sleepy in class.
A.is addicted to;There is
B.addicts;There is
C.addicts;It is
D.is addicted to;It is
某妇,29岁,G3P0,妊娠8周,首次来院作产前检查,患者担心新生儿有先天畸形,做羊膜穿刺术的时间是
A.妊娠8~9周B.妊娠10~12周C.妊娠13~15周D.妊娠16~20周E.妊娠20~24周