19题考察为何TT的从业人员同意接受Emily的实验。在文章三段最后两句，我们找到 了标志词“because”，这两句话阐述了某个因果关系。
　

Yet Rosa could not find any evidence that it works. To provide such proof, TT therapists would have to sit down for independent testing--something they haven't been eager to do, even though James Randi has offered more than $1 million to anyone who can demonstrate the existence of a human energy field. (He's had one taker so far. She failed.) A skeptic might conclude that TT practitioners are afraid to lay their beliefs on the line. But who could turn down an innocent fourth-grader? Says Emily: “I think they didn't take me very seriously because I'm a kid."
　

最后两句的大意为：谁会拒绝一个四年级的小孩？Emily说：“因为我是个孩子，所以他们没把我当回事。”
　

根据这两句话我们可以推断TT从业人员之所以参见Emily的试验，是因为他们认为Emily只是一个小孩子，参加她的试验应当没有任何危险。因此，19题D选项“They sensed no harm in a little girl's experiment.”（他们感到一个小女孩的实验没什么危险）是正确选项。（编辑：hxw.red）

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