题目内容

大豆灰斑病以____在种子或病残体上越冬。

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大豆灰斑病叶片上产生中央灰色或灰褐色病斑或病斑，潮湿时叶背病斑中央部分密生霉层。

种子带菌对大豆灰斑病病害流行关系不大。

A. 对
B. 错

What is the conversation about?

A. Having a birthday party.
B. Friends getting together.
C. Buying a skirt.

What gift does Mary receive from her grandmother?

A lovely dog.
B. A new shirt.
C. A fine skirt.