教学是______和______共同组成的传递和掌握社会经验的双边活动。
参考答案：教师教 学生学
(2013·厦门质量检测)Some fruits are so easily harvested in this area that they are never of great________.
A．fare
B．benefit
C．help
D．worth
Only when he returned _________ that the war had ended and the army had come back.
A．we tell
B．we told
C．did we tell
D．were we told
