关于龈沟液作用的描述,正确的是()
A.可清除异物,增进上皮与牙齿的贴附
B.抗菌作用
C.为微生物培养基
D.增强牙龈免疫能力
E.以上均正确
参考答案:B
After the Arab States won independence, great emphasis was laid on expanding education, with girls as well as boys _____ to go to school.
A.encouraging
B.being encouraged
C.be encouraged
D.to be encouraged