157.Hello,could I speak to Mr.Smith?

Sorry,wrong number.There isn’t ____ Mr. Smith here.

A./

B.a

C.the

D.one

158. In _____ review of 44 studies,American researchers found that men and women who ate six key foods daily cut the risk of ___ heart disease by 76%.

A.a;the

B.the;a

C.a;/

D./;a

157.答案是B,

此处为泛指，人名前用不定冠词，表示一个叫做。。。的人。

158.答案是C，

第一空为泛指；第二空心脏病heart disease习惯上不用冠词。