题干

如图所示为小明自制的一盏可调节亮度的小灯,闭合开关后,若要使灯泡变暗,应将导线夹向____(填“a”或“b”)端移动,小明认为这个装置在小灯调暗后比亮时能省电;但小林认为电路中的合金丝也要消耗电能,所以不能省电,那么,你的看法是____(填“能省电”“不能省电”或“不确定“),因为此时电路的电功率变____(大/小).

上一题 下一题 0.0难度 选择题 更新时间:2020-02-12 03:50:03

答案(点此获取答案解析)

b,能省电,小

同类题4

根据材料内容,从下面的五个选项中选出能填入文中空缺处的最佳选项,使短文意思通顺,内容完整,并将其标号填写在下面题号后的横线上。

                                                                        (C)

      If you think you're too shy and want to be a little braver, try the following. You can make it.

             There's no need to hide it. When they get to know you're a shy kid, they'll understand you better. This also helps you feel easier in talks.

              When you smile, people think you're friendly and easy to talk with. Remember that other people have feelings, too, and ①most people will stay away from an angry-looking face.

      Take one small step at a time. If you find it hard to start talks, say something nice about people around you.         Doesn't it make you want to keep talking to that person?

      Turn your attention elsewhere.         ②Don't waste(浪费) time worrying about your looks or whether people like you or not Don’t lose heart Each time after you say “hi” or smile at someone for the first time, say “I did it!” to yourself.        

Keep trying and one day you'll never be shy when you talk to others.

A. Try to smile more.

B. Tell people you're shy.

C. Or it could be something bigger, like buying yourself an ice cream.

D. Think about how great you feel when someone says something nice to you.

E. Think more about ways to enjoy the party or the game.