根据对语内容从方框中选择能填入空白处的最佳选项补全对话，其中有两项多余。
A: I bought a new camera yesterday.____
B: Sure, of course!
A: ____
B: Read some books on basic photography skills.
A: What else?
B: ____ Try to get more ideas from great photographers and their works.
A: By the way, there are many articles about how to get great photos online. ____
B: I think so. ____ They can help you.
A: Thanks a lot.
B: You're welcome.
A. What should I do first?
B. Do you think they are helpful? C. Where were these photos taken? D. When do you go out to take photos? E. You can also join a photography club F. They are often written by photography lovers, G. Can you give me some advice about taking good photos?
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为实数，则a等于 （ ）