如图为一个农业生态系统模式图,请据图分析回答:
Tom rode his motorbike to work yesterday and had a crash with a car. His motorbike was ________ and he was seriously ________.
在函数①y=3x2;②y=12x2;③y=−43x2中,图象开口按从大到小的顺序排列的是()
甲说:我不是第三名;
乙说:我是第三名;
丙说:我不是第一名.
若甲、乙、丙3人的预测结果有且只有一个正确,由此判断获得第一名的是____.