题目

请在图中的“○”中填入适当的电表符号，并标出电压表的“+”“-”接线柱，使两灯能以正确的方式连入电路_______． 答案：【答案】【解析】电流表与用电器串联，电压表和用电器并联，所以可以在图中画出电表符号，电流从电压表正接线柱流入从负接线柱流出。给短文填上合适的词。每空一词。The Earth is our home. We (1) _________ try our best to protect it. We can do many things. We can plant more trees. Trees help keep the (2) _________ clean. When we visit public places, take the rubbish away and (3) _________ it in the bin. We shouldn’t (4) _________ too much because cars use a lot of energy. Don’t use plastic bottles because too much plastic is bad for the Earth. We can use (5) _________ bottles. These are the easy things we can do. If everyone does these, we will have a better living environment.