拔除下列牙可使用扭转力的是（）
A.上颌前牙
B.下颌切牙
C.下颌磨牙
D.上颌双尖牙
E.上颌磨牙
参考答案：A
看图完成短文，每空一词
Look at the picture. I'm a 1 . My name is Panpan. I'm 2 China. I like eating 3 . I 4 in the
forest. My favourite activity is 5 trees. I have got a friend. It's a 6 . The monkey's name is Lingling.
She likes eating 7 . She comes from 8 , too. 9 is her favourite activity. We play 10 day. We
have a good time.
如图是小晖设计的压力传感器原理图，其中R是滑动变阻器，R0为定值电阻．压力F增大时，滑动变阻器接入电路的阻值______，电压表的示数______．（选填“增大”或“减少”）
