It is suggested real-time bid ads help advertisers to______.
A．ease competition among themselves
B．lower their operational costs
C．hold a stable customer base
D．provide better online services

单项选择题一种社会制度是否先进和具有优越性，从根本上说是看其能否()。

未分类题'The critics'(Line 5, Para. 5)most probably refers to those on the side of______.A．President ObamaB．Supreme CourtC．Arizona state governmentD．Scholars in the research

未分类题In the second paragraph, the author discusses______.A．the overall economic picture of the publishing industryB．the paradoxical situation faced by scientific journalsC．the different outlooks of newspapers and scientific journalsD．the favorable economic situation for scientific publishers

未分类题It can be learned from Paragraph 4 that top journals______.A．value criticism from non-star scientistsB．cover the most important informationC．predominate people's choice of informationD．favor new and exciting studies

未分类题To show the desirable effects of immigration, the author makes use of______.A．illustrationB．comparisonC．explanationD．induction

未分类题Which of the following can be inferred from the last paragraph?A．GM foods have so far proved good for human health.B．The critics are committed to the dominance of large firms.C．The target of GM criticism has change dramaticallyD．Big corporations ignore public concerns over GM issues.

未分类题Tom Macmillan criticizes GM crops for their______.A．incompatibility with organic cropsB．contribution to climate changeC．unpopularity among the publicD．high cost and harmful outcomes

未分类题Figures from CropLife associations are mentioned to show______.A．the high expenses for developing new GM cropsB．big companies' strengths in GM crops marketingC．the great costs of anti-GM movementD．the worsening of regulatory delays

未分类题A groups collective intelligence may be enhanced significantly when joined by someone of______.A．high intelligenceB．high prestigeC．high operating abilityD．high coordination ability

未分类题The social operating system is becoming increasingly______.A．inclusive and community-targetedB．compact and family-centredC．loose and individual-orientedD．exclusive and work unit-focused

未分类题It can be learned from Paragraph 4 that______.A．people nowadays communicate less with their physical neighboursB．people interact more often with those nearby than those farawayC．neighbourhoods are becoming more heavily populatedD．a digital form. of neighbourhood has come into being

未分类题'Null results'(Line 6, Para 5)most probably refers to study results______.A．with little significanceB．without the expected contentC．achieved from low-cost studiesD．unappealing or unattractive

未分类题Which of the following can be inferred from Paragraphs 3 and 4?A．E-readers face bigger pressure of technical updates than tablets.B．E-book sales relate more to tablets than to e-readers.C．Televisions have lower profit margins than e-readers.D．E-readers are more likely to ensure focused reading than tablets.

未分类题The author lists the evolution of iPod to highlight______.A．its great attraction for consumersB．the improvement in its core competenciesC．its enduring existence on the marketD．the excellent quality of this product

未分类题The last paragraph is written to show the authors______.A．confidence in the arrival of an e-reader eraB．denial of the possibility that tablets will kill e-readersC．worry about the threat from laptops to e-readersD．recognition of tables' advantages over e-readers