21. What is the finding reported in Doug Duncan＇s published paper?

Most students at American colleges texted while in class.

Professors were not effective in stopping phone use in class.

Ten percent of his texting students could not pass the course

Texting reduced course grades by half a letter on average,Students using their cellphones could lose one point.

正确答案：D

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54. What is Professor Dowrick＇s advice concerning online CBT programs?

53. What is the major finding by researchers at the University of York?

52. What has made online CBT programs increasingly popular?

51. What does the recent study say about online CBT programs?

50.How is Bill Thomas＇s new concept received?

49. What has Bill Thomas been persistently advocating?

48. What do we learn about Bill Thomas bringing animals and plants into the nursing home?

47. Why did Bill Thomas try something different in the nursing home?

46. What has Bill Thomas been doing for a quarter of a century?

55. What did the joint study find about the MOOCs several years ago?