— So he does. In________ opinion, travelling is relaxing and exciting.
A：my
B：his
C：her
D：your
We have made a survey among 1,000 students from a middle school about their favorite food. students like fruits according to the form.
Kind of food
Chocolate
Banana
Cookie
Apple
Percentage(百分比)
Of the students
20％
30％
15％
?
已知过定点P（﹣2，0）的直线l与曲线y= 2-x2相交于A，B两点，O为坐标原点，当△AOB的面积取到最大值时，直线l的倾斜角为____ ．
细胞内生物膜为细胞生命活动提供了广阔场所,不同细胞器增大膜面积的方式可能不同。下列有关细胞器增大膜面积方式的叙述中,错误的是( )
