单项选择题
( )。
A.<br /><img src="https://imgtest.ppkao.com/ExamPaperRes/2014/8/27/7170f72882b24e0580e4d01f7f98b916/925db29a-7bca-4e10-a96b-4dd1fede110f.jpg">
B.<br /><img src="https://imgtest.ppkao.com/ExamPaperRes/2014/8/27/7170f72882b24e0580e4d01f7f98b916/59a4e7da-f0ea-4798-bef1-2dbae7f3bf38.jpg">
C.<br /><img src="https://imgtest.ppkao.com/ExamPaperRes/2014/8/27/7170f72882b24e0580e4d01f7f98b916/d477cf10-c5b5-402e-bbf6-06b91cd2b6f6.jpg">
D.<br /><img src="https://imgtest.ppkao.com/ExamPaperRes/2014/8/27/7170f72882b24e0580e4d01f7f98b916/ff1d5c56-6eab-4d7d-9306-70481ff56ab9.jpg">