多发性硬化CT表现的三大特点是（）。
A.病灶小
B.多发
C.位于脑室旁
D.急性期病灶可强化
E.无占位效应
参考答案：A, B, C
3÷11的商是（ ）小数，保留两位小数约等于（ ）。
If only he ____ quietly as the doctor instructed, he would not suffer so much now. [ ]
A. lies
B. lay
C. had lain
D. should lie
