最可能是
A．脊髓髓内肿瘤
B．左髓外硬膜内肿瘤
C．右髓外硬膜内肿瘤
D．脊柱结核
E．大脑肿瘤
参考答案：C
比﹣1℃低2℃的温度是（ ）℃．（用数字填写）
We kept watching the house in the garden until the lights of the house ______. [ ]
A. went down
B. went by
C. went on
D. went out
