题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Make Stress Work for You Stress can come from all directions. Rather than only looking for ways to change the stress-filled situations, look for stress that can work for you. These methods are suggestions to make stress work in your favor. Colors of the walls, floor coverings, and furniture can reduce stress. Cooling greens and blues are positive colors that can reduce stress and create a sense of well-being. Choose friends carefully. Your choice of friends can be the ke有两个相同的灵敏电流计，允许通过的最大电流（满偏电流）为Ig=1mA，表头电阻Rg=30Ω，若改装成一个量程为3V的电压表，则应给灵敏电流计（　　） A、串联一个2990Ω的电阻B、并联一个2990Ω的电阻C、串联一个2970Ω的电阻D、并联一个2970Ω的电阻