She _____ a letter on the computer.
A. is typing
B. typing
C. type
D. are typing
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The water is too much. Please _____ the tap.
A. to turn on
B. turn off
C. turn on
D. to turn off
Let's clean the blackboard.(写出同义句) What ______ the blackboard .
A. about
B. cleaning
C. about cleaning
D. about clean
《资治通鉴》的体例是:
A. 编年体
B. 纪传体
C. 断代史
D. 国别史
《资治通鉴》纪史起于:
A. 上古三皇五帝时期
B. 夏启正式建立夏朝
C. 五代末年赵匡胤灭后周
D. 战国初期韩、赵、魏三家分晋