题干
In view of lacking preparations for the competition and not wanting to lose face,
Johnson eventually decided to _____.
A：drop i
B：drop off
C：drop back
D：drop out
答案(点此获取答案解析）
D
，其中函数
的图像是一条连续的曲线，则方程
在下面哪个区间内必有实数根 （ ）