斑点病类多发生于叶和果实上,是植物病中比较少见的一类病害。( )
参考答案:错
结膜炎时结膜囊的分泌物成分是()
A.泪液
B.脱落的上皮细胞
C.渗出物
D.病原体
E.睑板腺分泌物
A third of the class ______ noticed him ______ away without saying a word. [ ]
A. has; to go
B. have; gone
C. has; went
D. have; go