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问题 选择题

下列河流中汛期最长的河流是（　　）

A．珠江

B．长江

C．黄河

D．海河

答案

珠江、长江、黄河、海河四条河流在我国的位置从北向南依次是海河、黄河、长江、珠江，珠江纬度位置最低，流域内降水丰富，且雨季最长，形成了我国汛期最长的一条河流．

故选：A．

单项选择题

Government department head: We already have a code of ethics that companies doing business with the department are urged to abide by. The fact that virtually all of the companies have agreed to abide by it indicates that it is successful. Therefore, neither per ethics regulations nor enforcement mechanisms are necessary to ensure ethical behavior by companies doing business with the department.
Which of the following, if true, casts most doubt on the department head’s conclusion

A．The code of ethics applies only to companies that do business with the department.

B．The code of ethics was instituted only after it was discovered that several companies had committed serious violations of ethics in their business with the department.

C．A government investigation found that most of the companies that agreed to abide by the department’s code of ethics are not complying with it.

D．A survey of major companies found that several companies stopped doing business with the department because they did not want to agree to abide by the code of ethics.

E．(E) A study of codes of ethics for companies found that the codes are most effective when the top executives of companies that agree to abide by them are fully committed to following them.
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单项选择题

人体所需要的矿物质或无机盐类必须能够溶解于水，而且能够为肠胃所吸收，才为人体所利用。最容易为肠胃所吸收的是（）

A.硝酸盐与磷酸盐

B.硝酸盐与硫酸盐

C.氯化物与醋酸盐

D.硫酸盐与磷酸
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