For each of the following questions, arrange the sentences A, B, C, and D between sentences 1 and 6 to form a logical sequence with sentence 1 and sentence 6 as the starting sentence and the concluding sentence respectively.
(1) Critics have a legitimate concern.
A- Ads appearing next to search results accounted for about three-quarters of its business last year.
B- Sales jumped 125%, to $700 million, while net profits soared 146%, to $79 million.
C- But Google is still largely a one-trick pony.
D- Sure, Google’s numbers for its second quarter, which ended June 30, were impressive.
(6) Although this Ad market has been a red-hot market, it’s also starting to mature.