D1C治疗过程中，监测肝素用量适宜，APTT应延长（）
A.0.5倍
B.0.5～1倍
C.1.5～2倍
D.2～3倍
E.以上都不是
参考答案：C
They always lay in a large_____of tinned food in winter in case they are snowed up.
A．provision
B．supply
C．proportion
D．storage
