公司主营业务与产品是什么？
参考答案：
主营业务—快递、普运、COD；主营产品—当日递、次日递、隔日递、三日递、限时递。
CT显示椎管狭窄呈三叶草样变形的主要原因是由于（）
A.椎体后缘骨质增生
B.椎间盘突出
C.关节突增生
D.后纵韧带肥厚
E.前纵韧带肥厚
改错题
1.Although we are not in the same school,but we are still good friends.
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2.I would be such tired that I would want to go back home.
3.He is so young to go to school.
4.He got up too late that he missed the school bus this morning.
5.Tom was ill so that he didn't go to school
