题目

下面是在某小水塘中发现的物体或物质，请选出全部是生物的一项：①水  ②石块  ③泥沙  ④水草  ⑤青蛙  ⑥小鱼A．①②③             B．④⑤⑥            C．①③⑤          D．②④⑥  答案：B解析:水、泥沙、石块是非生物，水草、青蛙、小鱼是生物。  During World War II Malta managed to _____ most of Italian and German bombers by throwing up an effective anti-aircraft screen. 　　A. put out  B. shut out  C. come across D. get across