粘多糖病酶活性测定可通过采取_________、______、________细胞进行。
参考答案：外周血细胞；血清；培养成纤维
病人但坐不得卧，卧则气逆者为（）。
A.心阳不足，水气凌心
B.气郁化火，痰火扰心
C.肾不纳气
D.气血两虚
E.肝风内动
Too many hotels have been built and this has ________ prices, making holidays cheaper.[ ]
A. cut short
B. cut out
C. cut off
D. cut down
