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Lesson Two--listen and fill in the blanks with missing callsigns, numbers and letters-4 PIL: __ Control _ ___ , estimating boundary _CTL: _ maintain _ contact Control on___

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Lesson Two--listen and fill in the blanks with missing callsigns, numbers and letters-5 PIL: Ground _____ request time checkCTL: _ time ____ and a half

小麦上常见的蚜虫有哪几种？

A. 麦二叉蚜
B. 玉米蚜
C. 麦无网长管蚜
D. 小米蚜
E. 麦长管蚜

麦长管蚜是迁飞性害虫。

A. 对
B. 错

麦二叉蚜和麦长管蚜都能传毒，后者传毒力最强

A. 对
B. 错