题目

以色列科学家利用干细胞成功地制造出了心脏细胞，这种转变的原因最可能是干细胞（    ） A.分裂的结果     B.分化的结果    C.生长的结果    D.成熟的结果 答案：B23、What is “Walk to School”? Now we are working on a programmed of  “Walk to School”． We would like as many parents and children as possible to take part, even if in a small way．Children who walk to and from school along with their parents can learn essential （基本的） road safety and life skills． You can take part by… ■ Walking to and from school with your child every day. ■ Walking for one or two days during the week. ■ Encouraging others to walk, if you already do. Walking is great! ■ Walking is great exercise！A walk is good for your body and can keep you fit. ■ You won’t have to waste time looking for a parking site （停车点）. ■ It’s free．You’ll save money by not using the car. ■ It’s pollution-free. ■ It’s a good chance to talk to your children and to meet other parents, too. Enjoying walking to school! Here are some suggestions to help you and your child enjoy walking to school. ■ Plan a safe route （路线） together. ■ Teach children what a kerb（马路牙子） is and what it means. ■ Encourage your child to help you choose the safest places to cross the road. ■ Look at and discuss the things you see on your way － especially road signs and what they mean. Walk to school! Thousands of parents and children already take part, could you? Please go to www.walktoschool.org.uk for more information. 1．Who are encouraged to take part in the programmed of “Walk to School”? A．Children．                                              B．Parents and children. C．Bus drivers．                                             D．Teachers. 2．By walking to and from school, children can learn ________. A．driving skills                                               B．running skills C．road safety and life skills                             D．knowledge about science 3．Which is NOT the benefit （好处） of walking to school?     A．It can keep you fit.     B．It can save money.     C．It won’t pollute the air.     D．It can’t help you make new friends. 4．What is the first thing to do if you want to enjoy your walking to school? A．Plan a safe route with your children.     B．Learn what a kerb is and its meaning.     C．Choose the safest places to cross the road．     D．Find road signs and know their meanings. 5．According to the writer, you can know more about “Walk to School” by________.     A．reading a newspaper                       B．making a phone call     C．going to the Internet                       D．having a traffic lesson