题目

阅读理解 In my class in high school, there was a girl who wasconsidered the most unpopular. No one actually knows how this exclusion (排挤) came from, but we all followed it for no reason at all. One dayafter lunch, we girls sat on the track field, talking about things thathappened in our lives. Someone brought her up, and soon the topic transformedto laughing at the funny hairstyle of her, the stupid way she walked and.... Ifelt extremely uncomfortable but kept silent, because I didn't want to be theone supporting the common enemy. After all, it's just a shortgossip time among a trusted2020年春，中东地区正在经历蝗灾，因为蝗虫主要以农作物的叶和幼嫩的茎为食，为避免粮食危机，捕杀最有效的时期是（　　）A.蛹期B.幼虫期C.若虫期D.成虫期