将一个直角三角板和一把直尺如图放置，如果∠α=43°，则∠β的度数是（　　）

阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。

    Every day, I drive home along Colorado Blvd, a wide street with four lanes on each side of the median (中央分隔带护栏). I always notice a homeless man standing on the corner of Colorado Blvd, 1 for spare change with a sign in his hand.
Last Monday, when I was 2 him, he suddenly threw down his sign and rushed into the middle of the street. At this time I 3 a car moving across the 3 lanes of traffic and heading for the  median. The 4 man ran to the side of the car and attempted to push the car back in the right 5. He also knocked on the window of the vehicle, but all  6 Immediately, he ran across the small median into four lanes of oncoming traffic, 7 madly for the cars to stop. Thankfully, all speeding cars 8 to stop just in time to 9 hitting him. The car which was out of 10 came Moving across the median and the four lanes of traffic, where just seconds ago cars had been traveling with 11 speeds.
    The homeless man jumped back in front of the 12 to attempt slowing it down again. By this time, we were able to 13 and help the man stop the car 14 it ran into a supermarket on the other side of the road. As it 15 out, the woman driver had a heart attack while driving and became 16 in the front seat.
    The homeless man is indeed a hero. He spends every day getting 17 by people who are trying not to make 18 contact with him so that they don't feel bad not giving him money. Yet he didn't  even hesitate to risk his life to save this lady and other drivers who would have 19 into her. He didn't think of his safety, nor did he expect anything in return. Heroes do exist in the most 20 places.

某同学在生物老师指导下进行了“检测不同环境中细菌和真菌”的探究活动，实验小组的江玲玲同学选用了两套培养皿，她的目的主要是（  ）

阅读下列材料：

      第二次世界大战后初期，美国经济遥遥领先于其他资本主义国家。据统计，美国在资本主义世界工业产量中所占的比重达到53.4%，出口贸易占32.4%(1947年数字)，黄金储备占74.5%，是世界上最大的资本输出国，纽约成为世界唯一的金融中心；美国拥有最大的经济规模和市场、领先的科学技术，大大高于其他国家的人均国民生产总值。美国正是凭借自己的强大经济实力和优势，采取种种措施，夺取了世界经济霸权。

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 下面是文奇和包博等同学进行的电学实验：