下面是一位小学英语教师课堂听说教学的真实片断，请你从教学理念和教学步骤等方面分析该教师的听说教学的有效性。
This teacher has just taught preposition and in this lesson she is going to play a card game but she notices that there are a lot of things on pupils’ desks so she makes an on-the-spot decision.
T: ... Let’s play a card game. Now take out your cards. You all have 5 cards, right
Ss: Right, yes.
T: OK. Listen. Please look at me ... OK, now show me your paper, this one (holds on the paper). Put your paper in your desk. OK, now next show me your books. Right, put your books in your desk. OK, now last, show me your pencil box. Put it in your desk. OK, good. ... Now put your cards on the desk, on the left side.