问题
单项选择题
胸部透视有肺门"舞蹈征"的先天性心脏病是（）
A.房间隔缺损
B.肺动脉狭窄
C.法洛四联症
D.大动脉错位
E.主动脉狭窄
答案
参考答案：A
解析：房间隔缺损时，右心房、右心室、肺动脉均可扩大，肺门血管影增粗，搏动强烈，透视下可见肺动脉总干及分支随心脏搏动而一明一暗的肺门"舞蹈征"。
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胸部透视有肺门"舞蹈征"的先天性心脏病是（）
A.房间隔缺损
B.肺动脉狭窄
C.法洛四联症
D.大动脉错位
E.主动脉狭窄
参考答案：A
解析：房间隔缺损时，右心房、右心室、肺动脉均可扩大，肺门血管影增粗，搏动强烈，透视下可见肺动脉总干及分支随心脏搏动而一明一暗的肺门"舞蹈征"。
Everyone should do something to protect the environment. How did we help to save our earth this week? Let me tell you. First, my family try to save . We never left the lights on when leaving the rooms. We turn off the TV when is watching it. Mom only uses cold water in the washing machine. Second, we also start recycling this week. We to write on both sides of the paper, not just on one side. We also our rubbish into different bags for bottles, cans, paper and food. Mom keeps the plastic shopping bags from the supermarket to use them again as rubbish bags. These are great to help our environment. Third, my family also save water. We never take long baths and have short showers . We wash the toilet with used water. My sister and I don’t the tap running when we brushed our teeth. At last, mom and dad begin to save gas. Mom to drive us to school, but now my sister and I start riding our bikes to school. It’s hard work good exercise! This week dad and his workmates(同事) also start to go to work together in one and share the cost. This also help reduce greenhouse gases. These are great ways to help protect our environment.
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