第一节：语法和词汇知识（共15小题）
从a、b、c、d 四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
1. when i reached front door, i suddenly saw strange sight last night.
a. the;不填 b. a; the c.不填a d. the; a
2. as we all know，it is impolite to read others’ letters without their permission.
a. selfish b. published c. private d. public
3. doctors say that ________ sleep may cause the students poor memory and concentration at school .
a. lacking of b. lacked in c. lacking d. lack for
