题干

甲、乙两位同学进行百米赛跑,假如把他们的运动近似看作匀速直线运动,他们同时从起跑线起跑,经过一段时间后他们的位置如图所示,在下图中分别作出的在这段时间内两人运动路程s、速度v与时间t的关系图象,正确的是(      )

A:​

B:​

C:​

D:​

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A,D

同类题3

阅读理解。阅读下列短文,根据短文内容选择最佳答案。

    Would you believe that the first outstanding deaf teacher in America was a Frenchman? His name was Laurent Clerc. He became a friend of Thomas Hopkins Gallaudet and together they founded America's first school for the deaf.

    Laurent Clerc was born in a small village near Lyons, France, on December 26, 1785. When he was one year old, he fell into a fire, losing both his hearing and his sense of smell.

    At 12, Laurent entered the Royal Institution for the Deaf in Paris where he did well in his studies. After he graduated, the school asked him to stay on as an assistant teacher.

    Meanwhile, in America, Thomas Hopkins Gallaudet was studying to be a minister. He was very concerned about the lack of educational opportunities for the deaf. Therefore, in 1815, Gallaudet sailed to London, England to seek ideas on how to teach deaf people. While he was there, he met a French educator of the deaf who invited him to go to Paris to spend three months learning at the Royal Institution for the Deaf, the school where Laurent Clerc was teaching. Gallaudet accepted the offer. The two worked and studied well together. When the time came for Gallaudet to return, he asked Clerc to come with him. Clerc accepted on one condition: that he would stay in America only a short time.

    The two men set sail on June 18, 1816. The voyage across the Atlantic Ocean took 52 days; however, Clerc and Gallaudet put the time to good use. Clerc studied English, and Gallaudet studied sign language. They discussed the school for the deaf which they planned to open. On the long trip, they had many conversations about education and deafness. The year after they arrived, they founded a school for the deaf in Harford, Connecticut.

At the school, Clerc led a busy life. He taught signs to Principal Gallaudet; he taught the pupils; and he taught hearing men who came to the school to study deaf education.

    In 1819, Clerc married Eliza Crocker Boardman, one of his pupils. They had six children. He retired from teaching in 1858. Although he had intended to return to France, he never did. He died on July 18, 1869 in the United States.