Danny said the basketball ______ heavy.[ ]
A. is
B. are
C. was
答案：C
若方程x2-4x+m=0与x2-x-2m=0有一个根相同，则m=______．
下列哪项是羊水栓塞时羊水进入母体的途径
A．子宫静脉
B． * * 静脉
C．卵巢静脉
D．下肢静脉
E．宫颈黏膜静脉
