题目内容

He returned to Ohio so that he could _______ his passion for football.

A. indulge
B. involve
C. engage
D. concentrate

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Back pains can be the result of bad _______.

A. post
B. posture
C. gesture
D. position

Soon Peter arrived, white with fear, for he thought his ________ had come .

A. deem
B. doom
C. boom
D. blossom

Thousands of men and women have been preparing to _______ the world with their crisp steps and unified action on Oct 1.

A. flip
B. hoist
C. grin
D. dazzle

使用特定的颜色值（颜色键控或者色度键控）和亮度值（亮度键控）来定义视频素材中的透明区域，当断开颜色值时，颜色值或亮度值相同的所有像素将变为透明。

A. 灰度系数校正
B. 更改颜色
C. 键控
D. 分色