[单项选择]Questions 9 to 11 are based on the conversation you have just heard.
A. They became more excited.
B. They became bad-tempered.
C. They didn"t know what to do.
D. They shifted their attention.

参考答案:C
答案解析:[听力原文]
M: Michelle Hackman, a high school senior, won second place in a national science competition. She conducted a study to see what happens when a teenager is deprived of his or her phone. She joins us on the phone. Thanks very much for being with us.
W: Thank you so much.
M: And what did you do—just took cell phones out of teenagers" hands and started studying them
W: Yeah, I based my research on a market research study that made the claim that the reason why we can"t separate from our phones is that we become anxious. And so I wanted to see whether I would see that sort of behavior if I were to do that experimentally, just by taking cell phones away from kids.
M: And
W: Well, I actually found when I took them away, the kids became under stimulated, and almost didn"t know how to entertain themselves.
M: Oh. How did you observe
W: I used a biological feedback device. I observed levels of stimulation. And I literally saw that subjects who had phones taken away from them experienced decreases in their stimulation.
M: Now, I have been told you"re blind.
W: Yes.
M: How did you conduct the study
W: I couldn"t actually conduct the study myself because of the readings on the biological feedback meter, I couldn"t take myself. So I actually gathered a team of students to administer the study for me.
M: So what are you going to do What are your plans
W: I"m going to go to Yale in the fall to study psychology, and I will bring the cell phone research result with me.

What happened to those kids whose cell phones were taken away