何种口腔不良习惯可在4～6岁以后渐减少而自行消失
A．吮指习惯B．唇习惯C．咬指习惯D．舌习惯E．睡眠习惯
参考答案：C
—Jim, are you ________this Saturday?
—Oh, sorry. I need to go to the bookshop ________the bank on Saturday. [ ]
A. convenient; and
B. convenient; as well as
C. available; with
D. available; as well as
下列物质分类正确的是
A．CO2、CO均为酸性氧化物
B．氯水、氨水均为混合物
C．纯碱、火碱均为属于碱
D．牛奶、醋酸均为胶体
