A．it needs special training and a lot of practice
B．the lip reader has to focus on the other person constantly
C．the lip reader has to give tip normal life styles
D．lip-reading disturbs the work of a heating aid

A．be reached when low-income countries agree to reach an agreement
B．cause a collapse of the world economy
C．reduce in a large amount the content of CO₂in the atmosphere
D．help realize a stabled world economy