(单选题)Fingerprints are often used as a method of solving criminal case because ______(本题2.0分)
A.they can be obtained whenever they are needed
B.they can outline a criminal’s appearance
C.this method is simple though costing
D.this method is easy and inexpensive
出自:桂林理工大学大学英语4

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
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