请根据下面五个人对应用软件的需求, 参考应用软件(A—F)的简介, 为不同的人找到合适的应用软件(其中有一项为多余选项)。
____ Jenny has no time to take care of her 2-year-old son, so she needs an app for him to learn to speak.
____ Sam has to read some books but he has an eye problem, so he needs some app that can read books aloud to him.
____ Bob finds it difficult to remember the new words from the English books. He wants to improve in a relaxing way.
____ Cathy likes traveling. She needs an app that can make it easier for her to buy train or plane tickets.
____ John is going to have a long train trip. During the trip, he needs some games to kill the time.
A. Vocabulary Hero may help you learn more English words while you are playing games.
B. Rail Friend can be best helper when you find it hard to buy the train or plain tickets.
C. World of Tanks Blitz, an online game while can be the best choice to have fun in the travel.
D. Himalayas Reading has millions of books and you can listen to the books you like.
E. Baby Bus is a good friend for children under 3 years old to learn to speak.
F. Weibo can help you make friends on the Internet and know more about the world.
）一个，滑动变阻器一个，已调零的电流表、电压表各一块，开关一个，导线若干。请选用上述实验器材，设计一个实验证明：在R1与R2串联的电路中，如果R2的电阻值和通过它的电流保持不变，则电阻R1与R2的总电功率P与电阻R1的关系为P= kR1+ b（k和b均为不变量）。请画出实验电路图，写出实验步骤，画出实验数据记录表。