The growth of specialization in the 19th century might be more clearly seen in sciences such as ______.

单项选择题We can infer from the passage that ______.

单项选择题The direct reason for specialization is ______.

单项选择题The last sentence of the first paragraph most probably implies that it is ______.

单项选择题Some people do not openly admit they have ambition because ______.

单项选择题It is generally believed that ambition may be well regarded if ______.