脊硬膜和椎管之间的腔隙是（）
A.硬膜外腔
B.脊髓中央管
C.硬膜下腔
D.蛛网膜下腔
E.蛛网膜内腔
参考答案：A
He caught a bad cold. He ____on more clothes that day. [ ]
A. should have put
B should have putted
C. had put
D. was put
风门是不让风流通过的通风设施。
