题干
Football is played in more than 80 countries, it the most popular sport around the world.
A：making
B：to make
C：having made
D：and make
答案(点此获取答案解析）
A
）和开关各一个、导线若干。请你选用上述器材，设计一个实验证明“当电阻两端的电压保持不变时，电阻的阻值越大，电阻的电功率越小”。要求：