题目内容

The man's family cannot come to school because no planes are flying in South Africa.

A. 对
B. 错

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The man is very upset because his family cannot come to his gaduation ceremony.

A. 对
B. 错

大豆灰斑病由初侵染产生的病斑上产生大量分生孢子,借____传播,成为田间再侵染源。

A. 土壤
B. 昆虫
C. 气流
D. 灌溉

大豆灰斑病以____在种子或病残体上越冬。

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。