单选题Questions 18～20 are bused on a monologue about e-commerce. You now have 15 seconds to read Questions 18～20.

单选题Which is NOT mentioned about the characteristics of automated roads?

单选题Why is it forgivable for people to hope that they will live longer in the future than now?

单选题The author called Wikipedia people's encyclopedia because it______.

单选题Which of the following statement is Not correct according to the passage?

单选题Du Bois was a sociological and educational pioneer who challenged the established system of education that tended to restrict rather than to advance the progress of black Americans. He challenged what is called the "Tuskegee machine" of Booker T. Washington, the leading educational spokesperson of the blacks in the U. S.. A sociologist and historian, Du Bois called for a more determined and activist leadership than Washington provided. Unlike Washington, whose roots were is southern black agriculture, Du Bois"s career spanned both sides of the Mason-Dixon Line. He was a native of Massachusetts, received his undergraduate education from Fisk University in Nashville, did his graduate study at Harvard University, and directed the Atlanta University Studies of Black American Life in the South. Du Bois approached the problem of racial relations in the United States from two dimensions: as a scholarly researcher and as an activist for civil rights. Among his works was the famous empirical sociological study, The Philadelphia Negro: A Social Study , in which he examined that city"s black population and made recommendations for the school system. Du Bois"s Philadelphia study was the pioneer work on urban blacks in America. Du Bois had a long and active career as a leader in the civil rights movement. He helped to organize the Niagara Movement in 1905, which led to the National Association for the Advancement of Colored People (NAACP), established in 1909. From 1910 until 1934, Du Bois edited The Cr/sis, the major journal of the NAACP. In terms of its educational policy, the NAACP position was that all American children and youth should have genuine equality of educational opportunity. This policy, which Du Bois helped to formulate, stressed the following themes: (1) public schooling should be free and compulsory for all American children; (2) secondary schooling should be provided for all youth; (3) higher education should not be monopolized by any special class or race. As a leader in education, Du Bois challenged not only the tradition of racial segregation in the schools but also the accommodationist ideology of Booker T. Washington. The major difference between the two men was that Washington sought change that was evolutionary in nature and did not upset the social order, whereas Du Bois demanded immediate change. Du Bois believed in educated leadership for blacks, and he developed a concept referred to as the "talented tenth," according to which 10 percent of the black population would receive a traditional college education in preparation for leadership.

单选题The pilot asked all the passengers on board to remain ______ as the plane was making a landing. A. seat B. seating C. seated D. to be seating

单选题It seems that now a country's economy depends much on ______.

单选题 A parent with a child carrying a musical instrument or a drawing board walking along a Beijing subway platform or street is a familiar sight on weekends. They are on the way to training schools. Education of their children has become the most important responsibility of parents who were sent to rural areas for "re-education" during the "Cultural Revolution" from 1966 to 1976. They lost the chance for university education and now hope their children can receive a better education than they did. As a result, these people now in their forties expose their little children to early training so that they can enter a prestigious school. The parents imagine a road to success: from excellent primary and middle schools to an elite university and then to a good job. On average, they may spend about 100 yuan a month on their children's education. And what results have these parents obtained? Most of them feel that the large investment has failed to lead to rapid progress in their children's study. "We seem to be throwing our money away," said one parent. However, many parents still think that spending more on their children's schooling will result in high scores. These parents have also introduced a "contract system", which offers rewards for good school grades. More than 80% of parents in families in Chengdu have signed contracts with their children, according to the Consumers' Times. The paper notes that the heavy pressure put on children to perform well at school has resulted in a decline in children's health. The parents' investment in their children also includes hiring tutors. A survey of 250 students in Xuzhou found that 10% of their parents hired tutors. The pay for one tutorial hour is three yuan. Liberation Daily commented that these parents have too high expectations of their children. According to the article, "They are trying to help the young plants grow by pulling them upwards." They ignore their children's psychology and perhaps will damage the real talents the children possess.

单选题The U.S. achieved its predominance after World War Ⅱ because ______.

单选题When he got out of bed, Scobie ______