由病毒.类菌原体和类病毒以及多数线虫引起的病害，在植物病部表面（）表现病症。
A.都不
B.都
C.小部分
D.大部分
参考答案：A
根据句意，用括号中所给词的适当形式填空。（5分）
小题1:Don’t give up ________________(study)English well. It’s very important for us.
小题2:To ________________(us)surprise, he has made much great progress.
小题3:Can you make a ___________________(decide)about it?
小题4:Nobody likes to be friends with anyone who is __________________(honest).
小题5:The old man is ＿＿＿＿＿(know),he almost(几乎)knows everything.
原代培养
