题目

Here are the most popular Toronto activities.Niagara Falls Full Day TourOn this attractive tour, you will step aboard a luxury bus and head to famed Niagara Falls. On your arrival, you’ll take a voyage on the Maid of the Mist or Journey Behind the Falls (depends on weather conditions) to get as close to this natural wonder as possible. Then feast on an appetizing buffet lunch while enjoying the breathtaking sights of Niagara Fall. Afterwards, spend time exploring the shops and attractions of the charming, scenic town Niagara-on-the-Lake. It’s sure to be a day filled with beauty and wonder.某课外活动小组将锌片和铜片插入一个西红柿中，用电压表测量到铜片与锌片间电压为0.30V，然后又将这样的西红柿电池10个串联成电池组（n个相同电池串联时，总电动势为nE，内电阻为nr），与一个额定电压为1.5V、额定功率为1W的小灯泡相连接，小灯泡不发光，量得小灯泡两端的电压为0.3V，对此现象的解说各同学不一，其中摘录如下，其中说法正确的是（     ）A．西红柿电池组的电动势大于小灯泡的额定电压，小灯泡已烧毁； B．小灯泡的实际功率小于0.04W，太小了； C．西红柿电池组输出的电功率太小； D．西红柿电池组的内阻太大。