众多的石窟遗址是历史的产物，能够给人类提供重要的、有价值的知识和信息，它()
A具有科学研究价值。
B反映了当时社会条件下生产力发展水平、科学技术水平和人们的创造能力。
C为科学史的研究提供了实物资料。
D对科技史的修正和完善具有重要意义。

A. the products are too difficult to use
B. the companies don"t listen to consumer complaints
C. US-made electronics are unreliable
D. consumers are losing faith in products that don"t do what they want them to do

A. George Osborne increases the rate of VAT merely to obtain more revenue.
B. The pace of British recovery will moderate to some extent.
C. The Bank of England has lost some credibility due to forecasting lapses.
D. The inflation rate in 2010 was above 3% in British Isles.