73. What does Harrison do first when testing ice cream?
(A) He stirs the ice cream.
(B) He examines the color of the ice cream.
(C) He tastes the flavor of the ice cream.
(D) He lets the ice cream warm up.

采用直接找文法找到答案。文章第四段叙述了Harrison检测冰糕的过程，首先是让其温度升高。