右边黑色部分的面积是()
A.50π
B.50(π-2)
C.50(1-π)
D.50(π-1)
参考答案:D
过抛物线y2=4x焦点的直线与抛物线交于不同的两点A,B,则|AB|的最小值是______.
-What can you see in _______ picture?
-I can see _______ flowers. [ ]
A. the; an
B. the; a
C. the; some