腰椎峡部断裂X线双斜位片表现是（）。
A.呈“狗脖子戴项链”状
B.V形改变
C.“三明治”样外观
D.“手风琴”样改变
E.无改变
参考答案：A
Alice was supposed _____ at home, but her mother found her surfing the Internet．
A．studying
B．to be studying
C．to have studied
D．studied
水银气压表安装在通风良好的气压室内的理由是保持室内凉爽。
