[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．_________

正确答案 ：D

states

[单选题]一Cars moved very slowly in the l920’s．一Yes，but they_________move more quickly than 1910．

正确答案 ：B

did

[单选题]下列各句，没有语病、句意明确的一句是 ( )

正确答案 ：B

有些作家背离了大众欣赏的习惯，弄些菲驴非马的东西，却自诩是在搞探索和实验。

[单选题]淀粉水解生成葡萄糖，能用来检验淀粉已水解完全的试剂是 （　　）

正确答案 ：A

碘溶液

[单选题]心肌不会产生强直收缩，其原因是（　　）

正确答案 ：C

心肌的有效不应期特别长

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