我国解放后新增加的荒漠面积中，有95%是人为活动造成的，其中“贡献”最大的是 ( )
A．过度放牧
B．破坏森林
C．过度农垦
D．工矿开发
参考答案：A
The reading club in our school _____ three years ago and I have been one of the students _____ charge of it. [ ]
A. set up, on
B. was started, in
C. put up, at
D. created, in
根据对人体的致病性，能引起人类食物中毒的细菌属于（）
A.条件致病菌
B.酵母菌
C.非致病菌
D.致病菌
E.腐败菌
