【判断题】【消耗次数：1】
花生病毒病主要通过种子、蚜虫、花生蓟马传播
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正确
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错误
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【判断题】
花生病毒病发病规律：如果播种的种子带有病毒源，那么主要靠蚜虫传播。一般花生苗期蚜虫发生早，数量大，易引起病害严重流行。花生苗期降雨少、气候温和、干燥，容易导致蚜虫大发生，造成病害流行。如果及时地预防蚜虫，病毒病的发生程度就比较轻
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正确
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错误
【多选题】
花生根线虫病的发病条件（）
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A土温：土温11～12℃时卵开始孵化，15℃时幼虫破壳孵出。幼虫发育适温25～28℃
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B土壤湿度：一般干旱年份病重，多雨年份病轻。幼虫侵入的最适土壤含水量是70%。线虫可因土壤湿度变化而上下移动
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C土质通气良好质地疏松的沙壤土或沙土病重，尤其肥力低的山岗薄发病重。低洼、返碱和粘性土壤发病轻或不发病
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D连作地发病重，轮作地病轻
随机题目
【单选题】
2． Listen to the two girls by the window. What language _________?
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didyouspeak
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weretheyspeaking
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aretheyspeaking
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havetheybeenspeaking
【单选题】
4.I do every single bit of housework ____my husband Bob just does the dishes now and then.
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since
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while
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when
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as
【单选题】
9．The hero often said， “One should love ______ country！”
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it’s
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their
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one’s
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himself
【单选题】
6.I hope she is getting better.It`s said he ___a bad cold for a month.
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hashad
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hadhad
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has
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washaving
【单选题】
8．We ______ last night， but we went to the concert instead．
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musthavestudied
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mightstudy
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shouldhavestudied
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wouldstudy
【单选题】
5.---Is your daughter studying for an examination ? --- Yes, he`s ____it next week.
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doing
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making
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togive
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totake
【单选题】
3．John, look at the time.____you play the piano at such a late hour
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Must
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Can
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May
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Need
【单选题】
26.I was really anxious about you.You ___home without a word.
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mustn`tleave
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couldn`thaveleft
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needn`tleave
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shouldn`thaveleft