问题
选择题
蜻蜒的发育属不完全变态发育.其发育过程比完全变态少了一个什么时期( )
A.卵
B.幼虫
C.蛹
D.成虫
答案
蜻蜓属于昆虫,其发育过程包括:受精卵→幼虫→成虫三个时期,为不完全变态发育,而像蜜蜂、蚊子、苍蝇等的发育过程包括:受精卵→幼虫→蛹→成虫四个时期,为完全变态发育,所以不完全变态发育比完全变态发育少了一个蛹期.
故选:C
蜻蜒的发育属不完全变态发育.其发育过程比完全变态少了一个什么时期( )
A.卵
B.幼虫
C.蛹
D.成虫
蜻蜓属于昆虫,其发育过程包括:受精卵→幼虫→成虫三个时期,为不完全变态发育,而像蜜蜂、蚊子、苍蝇等的发育过程包括:受精卵→幼虫→蛹→成虫四个时期,为完全变态发育,所以不完全变态发育比完全变态发育少了一个蛹期.
故选:C
Many people like traveling for their holiday. They go to 1 , seaside or forests. Some people like 2 , so they like to visit some old interesting places. In many countries, the travel agency can help you 3 your holiday. You can tell the travel agency what kind of 4 you like, how much 5 you want to spend, and the travel agency will give you a lot of information about where to go, how 6 there, where to stay, and what kind of activities you can do there. 7 the holidays is 8 “Package” holiday. 9 is, you just pay the money, and the travel agency will plan 10 for you, the ticket for the train or plane, the hotel, the activities, and so on.
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