有关南极洲的叙述，正确的是：（ ） A、是各大洲中跨纬度最广的大洲； B、是各大洲中跨经度最广的大洲； C、周围直接濒临三大洋；
适合该地区生长的主要经济作物是（ ） A.棉花、亚麻 B.甜菜、小麦 C.高粱、黄麻 D.甜菜、亚麻
I’m afraid these water _______（管子）may burst during the cold weather.
The meal over， the managers went back to the meeting room to their discussion. A.put away B.take down C.look over D.carry on
第二节 完型填空（共20小题；每小题1.5分，满分30分） 阅读下面短文，掌握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项
已知Mn2+是许多酶的活化剂，例如它能激活硝酸还原酶，当缺Mn2+时，植物就无法利用硝酸盐，这说明无机盐的离子 A．对维持细胞的形态和功能有重要作
Tom is an engineer in a small town near Paris One day, Tom arrived at the bus station quite early. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station
