Dr Bethune didn’t take a rest and he ________ working throughout the night.

A.that

B.when

C.whether

D.if

When King Philip V and his queen visited the city of Granada, they ______.

A. heard drums and royal music

B. didn't find fine horses

C. saw that there was no change in the palace

D. experienced an earthquake

A.contented

B.suitable

C.comfortable

D.interested

Dr。 Ben Carsen grew up in a poor single parent house-hold in Detroit。 His mother， who had only a 3rd grade education helds two jobs cleaning bathrooms。 To his classmates and even to his

teachers he was thought of as the dummest kid in his class。 According to his own not so fond memories。

He had a terrible temper， and once threatened to kill another child。 Dr。 Carsen was headed down part of seld distraction until a critical moment in his youth。 His mother convinced that he had to do something dramatic preventing leading a life of failure laid down some rules。 He could not

watch television except for two programs a week， could not play with his friends after school

until he finished his homework。 And had to read two books a week， and write book reports about them。 His mother’s strategy worked。 “Of course， I didn’t know she couldn’t read。 So there I was

submitting these reports。” he said。 She would put check marks on them like she had been reading them。 As I began to read about scientists，economists and philosophers。 I started imaging myself in their shoes。 As he got into the hobbit of hard work， his grade began to soar。 Ultimately he received a scholarship to attending Yale

University， and later he was admitted to the University of Michigan Medical School。

He is now a leading surgeon at Johns Hopkins Medical School and he is also the author of the three books。

Questions 23 to 25 are based on the conversation you’ve just heard。

Q23 What do we learn about Ben Carsen ？

Q24 What did Ben Caren’s classmates and teachers think of him whenhe was first at school？

Q25 What did Ben Carsen’s mother tell him to do when he was a school boy？

A、is

B、was

设,求dr/dx|_t=0.

请帮忙给出正确答案和分析，谢谢！