John gearhart’s early years were full of hardship. his father died when he was only si

x. after his father’s death，his mother placed him and one of his brothers in gerard college，an all-male orphanage where he stayed until he graduated and entered pennsylvania(宾夕法尼亚)state university.

his memories of the family farm led him into horticulture(园艺).the study habits he had acquired in the orphanage helped him a great deal because he did not care for the life outside his university， and gearhart saw many of his former classmates fall behind， then， as he puts it， he “fell in love with genetics.”

after earning his b. sc. in biological(生物的)science at penn in 1964，he moved to the university of new hampshire(新罕布什尔州)，where he got his m. sc in genetics in 1966. he received his ph.d. degree in genetics， development&embryology(胚胎学)from cornell university in 1970.

through all these years gearhart had only occasional contact with his mother . his studies had led him far from the farming concerns of his family in pennsylvania，when his mother became seriously ill，she came to johns hopkins hospital for treatment， and it was only then， in her last months of life， that gearhart felt he finally came to know the mother who had been forced to give him up so many years before.

on november 10， 1998， john gearhart reported his important findings in genetics. he is now one of the most famous scientists in the united states， a leader in the field of genetics research..

51、John Gearhart was sent to the orphanage because______.

A.his mother was ill

B.his father died

C.his father couldn't support his family

D.his mother didn't like him

52、it can be learned from the passage that ____contributed a lot to his success.

A.one of his brothers

B.his classmates in the orphanage

C.his memories of the family farm

D.his study habits developed in the orphanage

53、John Gearhart attended all the following universities EXCEPT____.

A.Cornell University

B.Pennsylvania State University

C.University of New Hampshire

D.Johns Hopkins University

54、John Gearhart is well-known for his important findings in______.

A.biology

B.horticulture

C.genetics

D.farming

55、John Gearhart didn't understand why his mother gave him up so many years before until ___

A.his mother’s death

B.his great success in his work

C.his mother's last months of life

D.his graduation from Cornell university