儿科学的范畴包括()
A.研究儿童生长规律
B.研究儿童发育和行为
C.提高儿童疾病防治质量
D.研究儿童对人类社会的影响
E.提高儿童身心健康水平
参考答案:A, B, C, E
—Angela, you are going to buy a flat here, are you?
—Yes, but I can't _________ an expensive one. [ ]
A. spend
B. cost
C. pay
D. afford
Bad habits are no way easy to be ______; it needs your determination and perseverance.
A.replaced
B.moved
C.removed
D.got rid