新航路开辟后，世界贸易的中心转移到
A．地中海沿岸
B．亚洲太平洋地区
C．大西洋沿岸
D．北美地区
答案：C
Danny is very sleepy, And his eyes _____ slowly.[ ]
A. close
B. closes
C. closing
D. closed
属纯浆液性腺泡的大唾液腺是（）
A.腮腺
B.下颌下腺
C.舌下腺
D.唇腺
E.腭腺
