结合上皮
A.无角化层有上皮钉突
B.有角化层,无上皮钉突
C.有角化层,也有上皮钉突
D.无角化层,也无上皮钉突
E.以上都不对
参考答案:D
we___________last night,but we went to the concert instead.
A.must have studied
B.might study
C.should have studied
D.would study
18世纪下半叶,英国通过殖民扩张活动
①确立了海上霸主的地位 ②打败了西班牙的“无敌舰队”
③确立了资产阶级统治 ④成为最大的殖民帝国
A.①②
B.②③
C.①④
D.③④