题目

We have known for a long time that flowers of different plants open and close at different time of day. This is so familiar that there seems to be no need to ask the reason for it. Yet no one really understands why flowers open and close like this at particular times. The process (过程) is not as simple as we might think, as recent experiments have shown. In one study, flowers were kept in constant (连续的) darkness. We might expect that the flowers, without any information about the time of day, did not open as they normally do. In fact, they continued to open at their usual time.两定值电阻甲、乙中的电流与电压关系如图所示．现在将甲、和乙串联后接在电压为3V的电源两端，下列分析正确的是（ ）A. 甲的电阻值大于乙的电阻值B. 甲的电压大于乙的电压C. 甲消耗的电功率小于乙消耗的电功率D. 通过电阻甲的电流0.5A，通过电阻乙的电流为0.3A