如图所示，是小明使用光学仪器观察宣传标语 “请随手关灯”时看到“关灯”两字的情景，由此可以判断他使用的是（）

先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。

    Edward has a pet dog and his name is Liston．Every day he1Liston for a walk in the park．He loves his dog very much．

    This morning，Edward has to go to the art club．So he goes to Liston and says．"I will come back2soon(很快)，Liston．Just stay in the garden and sleep3the tree．"And then Edward goes to the4station and gets on the bus．

    Liston doesn't want to 5Edward．He runs after Edward quietly．6the bus goes too tast,so Liston has to stop．

    After Edward comes home,he runs into the garden to7Liston and play with him．"Liston! Liston !8are you?"he shouts．But he can't see his dog．

    Edward walks up and down the street and calls dog's9．Then he hears(听到) Liston's bark(吠声)．"Liston!Liston!I'm here．" Liston runs to Edward10．Liston was waiting for him near the station．