20世纪的战争与和平

材料：1946年到l 948年，针对日本战犯的审判工作在东京进行，远东国际军事法最终判处了7名甲级战犯死刑，16人无期徒刑，还有多人刑期不等的有期徒刑。东京审判被认为是国际社会对日本错误国策以及战争罪行的总清算，并向全世界宣告，策划、发动侵略战争是违反国际法的犯罪行为，参与战争犯罪的人，要对侵略战争负责。

    但这次审判充满了种种矛盾和斗争，而且最终的判决结果也没有得到很好的执行。盟军的总司令麦克阿瑟发出的所谓“战犯假释”的指令，岸信介等甲级战犯因此被释放和减刑，之后又撤销了各种“褫夺公职”的法令，这些战犯和曾经被清洗的人再次担任了公职，岸信介甚至后来担任了日本首相。至1950年，美国就提前释放了所有关押的日本战犯。

——摘编自《世界现代史资料汇编》

    Do I like to shop? Of course!  It's fun. Whenever I have free time, I go shopping. There is always something to buy—shoes, clothes, bags, books, etc.

                                                                      --Eileen

    I'm always shopping for my two daughters. Delia, my two-year-old daughter, often needs clothes or shoes. Jodie, my ten-year-old daughter, needs things for school. Do I ever shop for myself? Who has time? Is it fun? No way!

                                                                         Jane

    I don't care about clothes and luckily, I don't need to shop for my food. The only kind of thing I need to buy myself is about music.

                                                                         Nigel

    I like spending my flee time on something fun. To me, shopping is a necessity, not a pleasure (乐趣). I would like to dance, talk with my friends or play chess in my free time. I only shop when I have to.

                                                                         Louis

根据材料内容选择最佳答案。

电磁打点计时器是一种使用____（直流或交流）电源的计时仪器，它的工作电压是____ V，当电源的频率是50Hz时，它每隔____ s打一次点．

“观察DNA和RNA在细胞中的分布”实验中没有用到的试剂是(       )

8×7=____    8×6=____   5×8=____   8×3=____   8×4=____