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单项选择题

视网膜中央凹对光的感受分辨率高，其主要原因是（　　）。

A.感光色素含量高
B.感光细胞的兴奋性高
C.视觉传递系统呈单线联系
D.感光色素处于合成状态
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若取来的沥青试样含有水分时,首先应放入烘箱,在（ ）左右的温度下进行加热,至沥青全部熔化后供脱水用。
A.70℃
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Fill in each of the blanks in the following sentences with a suitable preposition or adverb.  1. Did you load the camera______200 or 400 film? 2. Can I borrow your pen? Mine has run_____of ink. 3. I am now working ______ a book about Chinese history. 4. You can e-mail your photos_______ my computer in my office. 5. Many people say they can no longer put up_____her bad temper (脾气). 6. Well,add_____all the money that you have coming in and work out all the money you have to pay out, and you'll know whether you are rich or poor. 7. Please make sure to turn _______the gas when you finish cooking. 8. Tell him how much it'll cost—that should wipe the smile________ his face.
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下列选项中，能促进胃排空的神经或体液因素是（　　）。
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