题干

小明同学的身高为1.70m,站在竖直的平面镜前1m处,他在镜中的像是____(实/虚)像,像到平面镜的距离为____m,当他以0.5m/s的速度沿平行于平面镜方向移动的过程中,他在镜中像相对于小明的速度为____m/s,像的大小将____

(变大/变小/不变).

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答案(点此获取答案解析)

虚,1,0,不变

同类题4

根据短文理解,选择正确答案。

    The timer is running. These people have 60 minutes to escape (逃脱) from a room they paid to be locked inside.

    It is a game with clues (线索) that are spread in the room. And there is no starting point. You start wherever you feel like. It is up to you to put the clues together in order to find the key to get out.

    A popular room offered by Timothy Smith in Washington D.C. is designed to mimic (模仿) the Oval Office in the White House. It is built like the office of the American president. The fun part of Escape the Oval Office is that anything here could be a clue to solving the puzzle. An old typewriter from the 1930s. Or the small table in the corner. Or the map of Washington D.C. on the wall. And then there are hidden messages that can only be seen under a black light.

    Sometimes, the telephone rings. “Would you guys like a clue?” The boss controls the game progress on a camera and calls to offer hints (提示) when needed.

    Teams can be made up of classmates, families, tourists, or a group of six friends and two strangers who just meet before the game starts.

    It's said that there are more than 800 Escape Room adventures in Washington D.C.. Each experience has different themes and stories. The rules for playing are similar, and solving the puzzle needs social, physical abilities and quick, creative thinking.

    It was a little stressful. Some of the clues seemed really complex (复杂的). But it was a lot of fun, and the players had no idea what to expect. 

    Escape Room adventure is popular because it gives any person a chance to be a detective or to be a James Bond. However, like most team sports, this game is really all about being a good teammate and having a good time.