When William Erasmus Darvin was born in December 1839，his father Charles Darwin began to carefully record observations of his firstborn in a notebook.Now housed at Cambridge University Library，it reads more like a research paper.
    Today we know a good deal about Darwin s theories.We know far less about how his private life-particularly his family- contributed to his work.But his notebook shows another side of the founding father of evolution：Darwin as a family man.
    Darwin's son William was born a year after the scientist first met London Zoo's first orangutan（猩猩），Jenny. "The orangutan for Darwin was like a window into the origins of mankind，" says John van Wyhe，director of Darwin Online.
    At this time，Darwin was already forming ideas about where humans came from，but he had never met one of our close ape（猿）relatives to test these theories.His meeting with Jenny helped build up his idea that we shared a common ancestor（祖先）.with apes.He was already looking for a "real relationship between humans and apes"，says van Wyhe.When he saw Jenny's facial expressions and noticed her social behaviour，he knew his ideas were right.
    What stood out to him was how human-like some of her behaviour was，which he wrote about in a letter to his sister Susan： "The keeper showed her an apple，but would not give it to her，whereupon she threw herself on her back，kicked and cried，just like a mischievous child."
    When his son was born soon after，it meant that he could see first-hand how a human child developed，and consider the relationship between humans and animals.The notebook shows Darwin as a good-humoured though curious father who is "playing with his young baby like he s another ape，says van Wyhe.
    His observations about both his family and Jenny the ape went on to influence his 1871 book.The Descen of Man and The Expression of the Emotions in Man and Animals，published in 1872.

（1）What did Darwin do after his first child was born？ （no more than 10 words）

He recorded observations of his firstborn in a notebook.

He recorded observations of his firstborn in a notebook.

（2）What idea did Darwin hold before meeting Jenny？ （no more than 10 words）

He was already forming ideas about where humans came from.

He was already forming ideas about where humans came from.

（3）What does the underlined word probably mean in Paragraph 5？ （1 word）

She looks like a naughty child.

She looks like a naughty child.

（4）What does the text mainly want to tell us？ （no more than 10 words）

Darwin's observations of his firstborn contributed to his works.

Darwin's observations of his firstborn contributed to his works.

（5）What can you learn from Darwin？Please explain. （no more than 20 words）

He is persistent and insistent on science，serious and responsible for science.

He is persistent and insistent on science，serious and responsible for science.