One day while a girl was walking in the woods she found two starving songbirds. She took them home and put them in a small (16) She cared for them and felt great love for them.

Once the (17) and per of the two birds flew from the cage. Therefore, (18) he flew close, she grasped him (19) She felt glad, but suddenly she felt the bird go limp. She opened her hand and (20) in horror at the dead bird.

She noticed the other bird moving back and forth on the edge of the cage. She could feel his great need for (21) She lifted him from the cage and (22) him softly into the air. The bird circled once, twice, three times.

The girl watched delightedly at the bird’ s enjoyment. Her heart was no longer (23) with her loss. Suddenly the bird flew closer and (24) softly on her shoulder. It sang the sweetest melody that she had ever heard.

The fastest way to (25) love is to hold on it too tightly, while the best way to keep love is to give it WINGS!

21().

A.freedom 

B.food 

C.love 

D.space

如图所示，为甲、乙两物体相对于同一坐标的图像，则下列说法正确的是（）

①甲、乙均做匀变速直线运动

②甲比乙早出发时间t₀

③甲、乙运动的出发点相距x₀

④甲的速率大于乙的速率

A.①②③

B.①④

C.②③

D.②③④