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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Passage2Questions 21 to 25 are based on the following passage:People travel for a lot of reasons. Some tourists go to see battlefields or religious shrines. Others are looking for culture, or simply w...
A.
they want to see historic remains or religious spots.
B.
they are interested in different cultural traditions and social customs.
C.
they would like to take pictures in front of famous sites.
D.
they wish to escape from the cold, dark and rainy days back at home.
【多选题】以下描述符合柑橘小实蝇发生规律的有
A.
一般每年发生3~5代,而且无严格的越冬过程,各代生活史相互交错,世不整齐,各种虫态并存。
B.
以成虫产卵于柑橘幼果中.被产卵的果实有针头大小的产卵孔存在,由于产卵孔排出汁液,凝成胶状,形成乳状突起。
C.
幼虫孵化即在果内为害,幼虫期随季节不同而长短不一,一般夏季需6~9d,春秋季需10~12d。
D.
幼虫蜕皮2次。幼虫老熟后即脱果入土化蛹。入土深度一般3cm左右,砂质松土中较深,粘土较浅。