出血少而缓的外伤出血不需用（）止血。
A.加压包扎法
B.创可贴
C.冷凝法
D.压迫止血
参考答案：A
What ________ you ________ at this time yesterday?
A．did, do
B．have, done
C．were, doing
D．are, doing
We usually have six lessons a day, and each of them ____ 40 minutes.[ ]
A. last
B. lasts
C. have
D. need
