单项选择题
A．serious writers would rather not use the word "Okay" B．the word is invented by a political organization C．the word is absolutely an American invention D．the word was first used by the Indians
A．that it is cooler there B．that they do not like sunlight C．not mentioned in the passage D．that they like red light
A．Fast food is popular because of the high fat. B．Fast food is good to us. C．Fast food has rich nutrients. D．Fast food has its advantage and disadvantag