In no time the interlopers had progressed to the center of the industrial plant. They moved in silence with the precision of a military crew, but as the swirling oil eddied around them, it became clear that the original plan had gone awry. Had they turned a wrong corner, or was their entire adventure an unexpected trap? Whatever the explanation, there was little time to lose....Our intermediate Chinese lesson for today is a short listening test with ten devilishly difficult questions. If you fancy you've excellent Chinese take a listen and see how you do on our accompanying quiz. It is harder than you think!