[简答题]《铁路旅客运输规程》中,补收票价时,需要核收手续费的情况有哪些?

We still do not know all of the reasons why babies are born sick or with major disabilities. But we do know (31) . One baby, maybe more, (32) of one hundred is born with a serious genetic problem. Gene therapy (33) a very real possibility of correcting many of these disorders. It could transform — indeed, it already has — lives that are doomed (34) the pain and anguish of chronic illness. But scientific advances can also generate misunderstanding and fear. The Salk polio vaccine, so closely identified (35) the March of Dimes, was one of the most important medical gains of our time. It was safe. It worked. But (36) earlier vaccine used "live" viruses that caused fatalities, researchers (37) to overcome public apprehension.
Some critics are concerned that gene therapy will be abused create "super" humans. (38) are disturbed about possible disclosures of personally sensitiv

Excitement, fatigue, and anxiety can all be detected from someone’s blinks, according to psychologist John Stern (21) Washington University in St. Louis. Stern specialized in the study on these tiny twitches, using them as sensitive (22) of how the brain works. "I use blinks as a psychological measure to make (23) about thinking because I have very little (24) in what you tell me about what you are thinking." He says. "If I ask you the question, ’what does the phrase a rolling stone gathers no moss mean’ you can’t tell me (25) you’ve started looking for the answer. But I can, by watching your eyes."
Blinks also tell Stern when you have understood his question--often long before he’s finished asking it--and when you’ve found an answer or part of (26) . "We blink at times (27) are psychologically important." He says. "You have listened to
A. scientists
B. they
C. psychologists
D. subjects