一种外表类似苹果的水果被培育出来，我们称它为皮果。皮果皮里面会包含少量杀虫剂的残余物。然而，专家建议我们吃皮果之前不应该剥皮，因为这种皮果的果皮里面含有一种特殊的维生素，这种维生素在其他水果里面含量很少，对人体健康很有益处，弃之可惜。 以下哪项，如果为真。最能对专家的上述建议构成质疑( )

A．皮果皮上的杀虫剂残余物不能被洗掉

B．皮果皮中的那种维生素不能被人体充分消化吸收

C．吸收皮果皮上的杀虫剂残余物对人体的危害超过了吸收皮果皮中的维生素对人体的益处

D．皮果皮上杀虫剂残余物的数量太少，不会对人体带来危害

I was reading Shirley Hazzard’s novel The Transit of Venus. Though I (51) her other books, I had always resisted this one. It (52) me as too pure somehow, too heroic, larger or finer than life and therefore unreal. But now I read it with an almost (53) pleasure. There were sentences that (54) of gratification to my eyes and (55) the hairs on the nape of my neck. I was in a Boston hospital, propped tip in bed with a feeding tube in my arm after (56) surgery for cancer. It was

(57) double room and my roommate, who (58) when he spoke because he had both a broken chin and a drug habit was spraying the air for the fourth or fifth time that day with (59) had a television set and a radio going (60) . The diagnosis of my case was ambiguous. When I asked the doctor the usual question-How much time have I got—he hesitated before answering. "I would say," he said, "that you have in the neighborhood of years.\

56().

A. undergoing

B. undergo

C. had underwent

D. underwent