题目

B Below is a table which shows the melting(液化)and boiling points of common substances.Study the table.Then do Numbers 4—7. SubstanceMelting point(C)Boiling Point(C) Water Alcohol Nitrogen Oxygen0 –117 –210 -218100 78 –196 –183 4.The underlined word‘substances'means‘a type of'_________. A.matter        B.liquid            C.solid         D.gas 5.Which of the four should be a liquid at-90 degrees? A.water         B.alcohol           C.nitrogen      D.oxygen 6.Mixing alcohol and water is often used to wash windscreens of cars dur（2005?睢宁县）欣欣幼儿园庆祝儿童节，买巧克力糖12千克，比买的奶糖少6千克．现将两种糖混合后，平均分给6个班，每班分得多少千克糖？