问题
单项选择题
在作物受虫害损失的一般测定中,将作物受害株与未被害株相比减产的比率称为()。
A、被害株率
B、损失系数
C、产量损失百分率
D、单位面积实际损失
答案
参考答案:B
在作物受虫害损失的一般测定中,将作物受害株与未被害株相比减产的比率称为()。
A、被害株率
B、损失系数
C、产量损失百分率
D、单位面积实际损失
参考答案:B
从方框的选项中选择恰当的句子完成对话。
A: Jim, you said you would not stay out late after school, didn't you? B: Yes, mom. I did. . A: But it's 10 o'clock now __1__ B: Sorry, I've been to the hospital. A: What?__2__ B: No, I sent Jack to the hospital. A: Oh, really?__3__ B: He had a terrible headache on the way home. A: Is he better now? B: __4__ A: Good for you, my dear! I'm very glad you can help others. B: __5__ |