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The main message the author wishes to convey in the text is that.
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可轻度刺激胃粘膜，反射性增加呼吸道分泌，使痰液稀释，易于咳出的药是
John F. Kennedy was the youngest American to be elected president of the United States. During the World War Ⅱ John F. Kennedy had an outstanding record in the Navy. After the war Kennedy worked briefly as a newspaperman, then entered polities. He was three times elected to the House of Representatives before becoming a senator from Massachusetts. In 1960 he was elected president in a very close race in which there were charges of irregularities.Kennedy’ s term of office was marked by the achievements in appeals to idealism, a broad participation of people in politics, and improved civil rights. In international affairs, Kennedy saw the failure of the American - backed invasion of Cuban missile crisis which brought Russia and the United States to the brink of war.The Kennedy family has experienced victories and tragedy. One of John Kennedy’ s sisters was mentally backward and an old brother was killed in the war. John Kennedy was assassinated -- as was his brother, Robert Kennedy. The family has suffered scandals of sex, alcohol, and drugs in both John’ s generation and in this present generation. Many believe that for the young, wealth and a prominent family too much, too soon, too easy are more of a curse than a help. Before he became American president, John Kennedy（）
糖皮质激素是由于下列哪个部分分泌的
John F. Kennedy was the youngest American to be elected president of the United States. During the World War Ⅱ John F. Kennedy had an outstanding record in the Navy. After the war Kennedy worked briefly as a newspaperman, then entered polities. He was three times elected to the House of Representatives before becoming a senator from Massachusetts. In 1960 he was elected president in a very close race in which there were charges of irregularities.Kennedy’ s term of office was marked by the achievements in appeals to idealism, a broad participation of people in politics, and improved civil rights. In international affairs, Kennedy saw the failure of the American - backed invasion of Cuban missile crisis which brought Russia and the United States to the brink of war.The Kennedy family has experienced victories and tragedy. One of John Kennedy’ s sisters was mentally backward and an old brother was killed in the war. John Kennedy was assassinated -- as was his brother, Robert Kennedy. The family has suffered scandals of sex, alcohol, and drugs in both John’ s generation and in this present generation. Many believe that for the young, wealth and a prominent family too much, too soon, too easy are more of a curse than a help. According to the passage, which of the following is TRUE（）
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