正确答案: C

opportunity

题目：One thing he felt regret for was that he never had the________of heating him play the piano．

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学习资料的答案和解析：

[单选题]_________

根据以下内容，回答下面的题目。Insure means to protect _51_ a loss of money．Most people can budget their money so that their income will cover expected expenses _52_ food, clothing, housing, and public services．But, there is no way to know _53_ who will suffer a crisis (危机) such as a serious illness, fire, flood, or a car accident．Such crises usually _54_ great expense．Even if people could predict crises, it would be hard to save enough money to _55_ the expenses．Insurance is a system _56_ a company collects money from many individuals and then pays certain expenses whenever one of those insured individuals is faced with a certain crisis．An insurance policy _57_ how much the insurance costs and how much the company will pay when a policy holder is faced with a certain crisis．There are many different kinds of insurance, _58_ hospital, motor-car and fire．Insurance can be rather expensive but most people buy insurance of some kinD．Insurance is something _59_ people buy and hope they will _60_ need．_________

states

[单选题]用单色光照射金属表面，使金属释放光电子，增大单色光的频率，但同时减小它的强度，则光电子的实际动能（　　）

增大

[多选题]下列各项中，支持咯血的是（　　）

患者有心脏病史

排出物为碱性

排出物为鲜红色

[单选题]肾的钠感受器是（　　）

致密斑