燃油修正具有以下（）特点。

A.在闭环工况下起作用

B．ECU通过对喷油量进行微调来控制空燃比

C．短期燃油修正是ECU依据氧传感器的电压信号进行喷油量的修正

D．长期燃油修正是ECU通过对短期燃油修正计算得来的，其目的是尽可能让短期燃油修正的数值接近0％，若长期燃油修正的数值超过5％，则表示发动机系统有故障

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!

Ⅱ. 完形填空

A．because

B．as

C．if

D．since