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问题 选择题

甲、乙两物体，质量之比是3：1，体积之比是1：3，甲、乙两物体的密度之比（　　）

A．1：1

B．1：3

C．9：1

D．1：9

答案

甲、乙两物体的密度之比为

ρ甲
ρ乙
=
m甲
V甲
m乙
V乙
=
m甲
V甲
•
V乙
m乙
=
3
1
×
3
1
=
9
1
．

故选C．

阅读理解

读短文找出Yangtang 的五位好朋友的所在地。

     Yangyang has five good friends. They are not from the same place. Dived lives in the north. His home is

in Lanark, near Glasgow. Alia also lives in the north. He is in Edinburgh. Mona is Alia's sister. She studies in

London. Anne lives in the west. Her hometown is near Cardiff, it's Newport. Pat is Anne's good friend. Her

hometown is also Newport. But she studies in Birmingham now.

                                                                                                                                                            

                                                                                                                                                            
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单项选择题

女，30岁。拔牙后3天开口逐渐受限，下颌下淋巴结肿大。除下颌支后缘稍丰满压痛外，其余无阳性体征。最可能的诊断是 :

A．翼下颌间隙感染

B．下颌下间隙感染

C．颞间隙感染

D．咬肌间隙感染

E．干槽症
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