A．By making laws．
B．By enforcing discipline．
C．By educating the public．
D．By holding ceremonies．
根据题干中出现的Ame—cannationalna9可以判断短文谈论的是有关美国国旗的话题。
短文主要介绍的是法律对美国国旗的使用规定，如：升降国旗都需手工操作完成；国旗不能被用作服装或运动服的一部分等.
A。本题出题点在开篇处。短文开始就提到，美国通过制定法律来管理国旗的使用，从而保证国旗得到尊重，故选A。
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B．It should be raised quickly by hand．
C．It should be raised only by Americans．
D．It should be raised by mechanical means．
A．It should be attached to the status．
B．It should be hung from the top of the monument．
C．It should be spread over the object to be unveiled．
D．It should be carried high up in the air．
A．There has been a lot of controversy over the use of flag．
B．The best athletes can wear uniforms with the design of the flag．
C．There are precise regulations and customs to be followed．
D．Americans can print the flag on their cushions or handkerchiefs．