具有（）的人员，不得从事特种作业。
A、脚气病
B、口吃病
C、癫痫病
参考答案：C
从个位起往左数第______位是亿位；第七位是______位；千万位的右边一位是______位，左边一位是______位．
18. – Students should devote most of their time to studying rather than playing computer games.
– ________. No pains, no gains.
A．Really
B．Obviously
C．Actually
D．Exactly
