月季细菌性根癌病的病原为______，寄主为月季。
A. 细菌
B. 真菌
C. 病毒
D. 害虫
下列关于树木根系生长的叙述中错误的是______。
A. 树木的根系无自然休眠期
B. 树木根系的生长高峰往往与地上部一致
C. 树木根系生长与地上部生长具有相关性
D. 早春时树木根系的生长往往比地上部要早
带土球苗木运输时，土质为沙性的小规格苗木，对土球采用______包装较为经济方便。
A. 扎草法
B. 蒲包法
C. 捆扎草绳法
D. 木箱包装法
Which of the following does the author mention as a possible disadvantage of telecommuting
A. Small children can't understand the boundaries of work and play.
B. Computer technology is not advanced enough to meet the needs of every situation.
C. Technological troubles can destroy the program.
D. The worker often does not have all the needed resources at home.
微信支付 
支付宝支付