摘要：Detective(侦探)Paul pays a visit(拜访)to his best friend,Mr Brain.Mr Brain is a great scientist.He studies(研究)desert(沙漠)plants(植物)and animals.He and his helpers(助手)areworking in the Sahara Desert(撒哈拉大沙漠).Mr Brain found a new kind of cactus(仙人掌).He is going to take it to his lab(实验室).But last night,someone stole(偷)his cactus from his tent(帐篷),His three helpers are the only suspects(犯罪嫌疑人).

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