Knowing people s habits beyond computers and phones helps Google______.
A. get comprehensive information of users
B. sell more computers and phones
C. sell its products directly to users
D. communicate with users more effectively
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国家对已成立的合同的不同态度，可将合同的效力分为哪几类？
Which of the following is NOT true according to Paragraph 2？
A. Teaching ability is the most important factor in teachers" promotion.
B. Other subjects have the same problems with economics.
C. Morden universities pay more attention to research than teaching.
D. Many teachers regard teaching as an obstacle in their work.
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