下列说法正确的是

A．据报道“2000年某市肺癌患病率为30/10万，肺癌死亡率为32/10万”。这里同年肺癌死亡率高于其患病率显然不正确
B．某工厂保健站在调查中发现946名工人中，患慢性病的274人，其中女性219人，占80%，男性55人，占20%，由此得出结论，女工易患慢性病
C．率的标准化是为了消除内部构成的影响
D．某病的构成比增大，该病的发病率亦增高
E．计算麻疹疫苗接种后血清检查的阳转率，分母为麻疹易感儿数

Which of the following statements concerning taxable bonds is TRUE（）

A. Corporates have the lowest yields, followed by Treasuries, then by corporates, which provide the highest returns.

B. Treasuries have the lowest yields, followed by corporates, then by agencies, which provide the highest returns.

C. Treasuries have the lowest yields, followed by agencies, then by corporates, which provide the highest returns.