Why are there white rings on each end of the football？
A. To help players see the ball.
B. To make it look nice.
C. To help players score.
D. To help players run.
Why did the farmers need scarecrows？
A. The crops were dying.
B. They were lovely figures.
C. They need shade from the hot sun.
D. Crows ate their crops.
企业进入市场所投入，而在退出市场时不能收回的一部分资本称为()
A. 机会成本
B. 有形资本
C. 沉没成本
D. 无形资产
Which of the following is NOT used to make a scarecrow？
A. Hay.
B. Sticks.
Clothing.
D. Food.
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