锈菌主要寄生危害寄主的哪部分,引起多种植物锈病。()
A、茎叶
B、花果
C、种子
D、根部
参考答案:A
In our school students are ________ according to how much they know and how old they are.
A.classified
B.combined
C.listed
D.made
一次献血400ml的好处不包括()
A、提高输血的安全性
B、降低采供血成本
C、收到金钱报酬