题目

新华社lO月4日电，瑞典皇家科学院诺贝尔奖评委会4日宣布，将2006年诺贝尔化学奖授予美国科学家罗杰.科恩伯格，以奖励他在“真核转录的分子基础”研究领域作出的贡献。关于转录的叙述，正确的是   A．转录的产物有3类RNA，但以密码子形式携带遗传信息的是mRNA B．转录时的原料是4种核糖核苷酸，模板是DNA分子中的一条链 C．转录的场所是核糖体，运载工具是tRNA D．转录时需要ATP供能，需要RNA聚合酶等阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。 　　About 25 million children in developing countries have no homes. So they live on city streets. United Nations Children's Fund says most of these children do not receive education or health care. 　　The private organization known as “Child Hope USA ” is trying to do something to help these children. The group has many goals. Child Hope USA wants to stop the spread of AIDS and the use of illegal (非法的) drugs among children. It wants to protect young girls from being mistreated sexually (性别上地). It wants to tell children how to protect themselves, how to survive (活下来) conditions on the streets and how to feel good about themselves. 　　Child Hope USA is trying to set up educational programs for the children. It is working with local groups to get their help in protecting the rights of street children. And it is trying to make international development groups more informed about street children. Some children begin living on the streets when they are five years old or younger. Four year olds can be found selling goods on the street corner or begging for food and money. Some of these children have lost their families because of wars or natural disasters, such as earthquakes and floods. Some are helping their families earn enough money to survive. 　　Studies show that more than one million children live and work on the streets in the Philippines. Seven million children live on the streets in Brazil. About 250 thousand children live on the streets of Mexico. Child Hope USA works closely with international and local groups. It has offices in Brazil, Guatemala, the Philippines, Britain, Canada and the United States. Child Hope USA also works to improve child labor laws. In 1992, Pakistan approved new laws to control child labor. The laws make it illegal for companies to lend money to families and let children repay the loan (贷款) by working in factories. Yet , about eight million children still are working in Pakistan to repay loans. 1．According to the passage, there are about ________ million street children in developing countries. [　　] A．25B．75 C．100D．10 2．Which of the following is not the goal of the Child Hope USA? It wants to ________ . [　　] A．build a school and a hospital to help the children B．help the children not to use illegal drugs C．teach the children ways to protect themselves D．help the children to go to school 3．Which of the following is the reason for the children's working on the street? [　　] A．They have no parents. B．They earn money to help their parents. C．They break away from their families, so they have to make a living by themselves. D．Either A or B. 4．Which of the following is correct ? [　　] A．Child Hope USA is trying to help the children through its own effort. B．Child Hope USA has an office in China. C．Street children's condition has improved, but the problems remain unsolved. D．Under the pressure of the law, no child in Pakistan is still working to repay loans.