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问题 多项选择题

系统性红斑狼疮的X线表现有（）

A.斑点或片状浸润性阴影

B.网状或结节状阴影

C.绒毛状或蝴蝶状实变阴影

D.胸腔积液或胸膜增厚

E.心脏阴影增大

答案

参考答案：A, B, C, D, E

选择题
设S(n)=
1
n
+
1
n+1
+
1
n+2
+
1
n+3
+…+
1
n2
，则（　　）
A．S(2)=
1
2
+
1
3
B．S(2)=
1
2
+
1
4
C．S(2)=1+
1
2
+
1
3
+
1
4
D．S(2)=
1
2
+
1
3
+
1
4
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选择题

The ________ look on her face suggested that she _________ the exam.

A．worrying ; didn’t do well in

B．worried ; didn’t do well in

C．worried ; did well in

D．worrying ; does well
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