6．聽下面一段材料，回答第18至第20題． 18．Why do we use the weather satellites to take pictures of the atmosphere？ A．Because the weather satellites can do it easily． B．Because clouds form there． C．Because the weather forms there． 19．When do scientists forecast（預(yù)報） the weather？ A．When they have received satellite pictures． B．After they have compared new satellite pictures with earlier ones． C．Before they received satellite pictures． 20．How long are they able to forecast the weather nowadays？ A．One day． B．Three days． C．Four or seven days．
7．聽下面一段材料，回答18-20題． 18．Why does Mrs Lin want to move out of her flat？ A．She wants to buy a new one． B．This flat is too small． C．The environment there is too terrible． 19．What does Mrs Lin often hear the boys doing？ A．Singing all night． B．Talking and laughing loudly at night． C．Dancing to loud music all the time． 20．What stops Mrs Lin from sleeping well？ A．Talking and laughing in the neighborhood． B．The light in the crowded street． C．The loud dance music from outside．
