What does the author mean by 'dumbing down'(Line 3, Paragraph 1)?
A．Becoming illiterate.
B．Becoming noiseless.
C．Getting clumsy.
D．Getting inflexible.

判断题文献研究法是通过全面搜集、鉴别、整理国内外与课题相关的文献资料，并通过对文献的研究，形成对事实科学认识的一种方法。()

未分类题According to Paragraph 2, the trend seems to have taken a turn for the better in thatA．adult readers read more widely.B．more people are advocating reading.C．the number of educated people is growing.D．the percentage of adult readers has increased.

未分类题Sunil Iyengar, the NEAs research director points out thatA．Hispanics are formerly considered the most reluctant readers before 2002.B．college graduates have dramatically increased their reading ranges.C．the increase has compensated for the decrease during the past 25 years.D．it seems that American people as a whole are reading more than before.

判断题而决定实验结果能否推广到更大范围的依据，就在于实验是否具有较高的内在效度。()

未分类题【C15】A．identified withB．negligible forC．targeted atD．responsible for