Python字典中update()方法用于更新字典中的键/值。有字典dic={"数学":89 ,"语文":78,"英语":96}，d={"物理":97,"语文":90,"信息技术":91,"地理":78}执行语句dic.update(d)后，dic的值为？（ ）
{"数学":89,"语文":90, "英语":96, "物理":97, "信息技术":91,"地理":78}
{"数学":89, "语文":78,"英语":96, "物理":97 ,"信息技术":91,"地理":78}
{"数学":89,"语文":78, "英语":96, "物理":97, "语文":90, "信息技术":91, "地理":78}
{"数学":89, "英语":96, "物理":97, "信息技术":91 ,"地理":78}
