植物根部受线虫子为害后表现的症状有（）。
A、根部肿瘤
B、根卷曲
C、块茎腐烂
D、分枝多
参考答案：A, B, C, D
我国最早向个体农户征收“农业税”出现在： [ ]
A．西周
B．春秋
C．战国
D．西汉
If you want to________in the world, you must learn to work hard while you are still young. [ ]
A. make much of yourself
B. make the way out
C. make you out
D. make your way
