既活血散结，又通经下乳的药是（）
A．穿山甲
B．干漆
C．五灵脂
D．莪术
E．血竭
参考答案：A
下列物质中，导电性最差的是（）
A.血清
B.肌肉
C.神经
D.脂肪
E.头发
Her family _____ much larger than mine four years ago. Her family _____ dancing and singing when I came in last night.
A．were; was
B．was; were
C．was; was
D．were; were
