题目

Do parents owe their kids anything? Starting from my position, parents do not owe their children a  16  education. If they can  17  it, they can  18    send them to the best universities. But they must not feel guilty if they can’t. If the children really want to go, they’ll find a  19  . There are plenty of loans (贷款) and scholarships for the bright and   20  ones who can’t afford to pay. When children grow up and want to   21 , their parents do not owe them a down payment on a house. They do not have the  22  to baby-sit their grandchildren. If they want t化学键使得100多种元素构成了世界的万事万物。关于化学键的下列叙述中正确的是(    )A.离子化合物一定含有共价键,共价化合物中不含离子键B.共价化合物可能含离子键,离子化合物中只含离子键C.构成单质分子的粒子一定含有共价键D.在Na2O中,除氧离子和钠离子的静电吸引作用外,还存在电子与电子、原子核和原子核之间的排斥作用
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