单项选择题

什么样花镜需要用背景？( )

A．单面观赏花镜
B．双面观赏花镜
C．对应式花镜
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单项选择题
在下列设备中，______是计算机的输入设备。A、键盘 B、显示器 C、打印机 D、绘图仪
单项选择题
“A patient with amyloidosis of renal pelvis and two patients with urinary bladder amyloidosis are described in this report.” The obvious problem in this sentence is ______.
A． The incorrect verb tense “are”
B．The incorrect subject-verb agreement “are”
C．The unbalanced sentence structure with a long subject
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