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能产生激素的细胞不一定能产生酶.

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    The United States is a country of immigrants. It is a place where people from all over the world come to build a better life. Some immigrants bring their families. Some bring a few of their favorite things. Others come alone with nothing but determination. One thing that every immigrant brings with them is their culture.

    American immigration began in 1607 with the colony (殖民地) of Jamestown. In 1620, another group of people left England to build a settlement in America. They wanted to go to a place where they could practice their religion freely. Then many more people left their homes in Europe to build a better life in America. Many also came to America from Africa. By 1770, more than two million people had moved to America. Later on, more people came to the United States than ever before.

    In cities all over America, you can see different cultures that formed this country. Many things that you may think of as being “American” are actually from a foreign culture. Some of the best examples of this are the foods people eat. Pizza and spaghetti are foods that all Americans know and love. But both of them are from Italy. Baseball is an all-American sport. But the hot dogs that people eat during the game are a type of food that was brought to America by German immigrants.

    Over time, pizza and hot dogs have become a part of what is considered to be American food. In the same way, different groups of people have come together to define what an American is. An American can be a person of any background. An American can be of any faith. An American can be of any skin color. They can speak English clearly. They can speak English with an accent. Each new immigrant adds something new to American culture. It will keep changing as more people come to this country.

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 文言文阅读,回答相关问题。
     【甲】舜发于畎亩之中,傅说举于版筑之间,胶鬲举于鱼盐之中,管夷吾举于士,孙叔敖举于海,百里奚举于市。
      故天将降大任于是人也,必先苦其心志,劳其筋骨,饿其体肤,空乏其身,行拂乱其所为,所以 动心忍性,曾益其所不能。
     人恒 过,然后能改;困 于心,衡于虑,而后作;征于色,发于声,而后喻。入则无法家 拂士,出则无敌国 外患者,国恒亡。然后知生于忧患,而死于安乐也。
                                                                                                              (选自《孟子·告子下》)
    【乙】夫学者所以求益①耳。见人读数十卷书,便自高大,凌忽②长者,轻慢同列③;人疾之④如雠敌,恶之如鸱枭⑤。如此以学自损,不如无学也。
                                                                                                               (选自颜之推《颜氏家训》)
     注释:①求益:求得长进。②凌忽:凌,欺侮;忽,轻视。③同列:同辈。④疾之:怨恨他。⑤鸱枭(chīxiāo):古人认为这是两种恶鸟。