1. [单选题]What is special about the battery?
A. It is built in an iPhone.
B. It is the smallest of its kind.
C. It can also be used as a charger.
D. It keeps power for about 30 days.
2. [单选题]6根据4判断，在非洲土地退化的区域中，面积最大的气候类型的特征是
A. 全年高温多雨
B. 全年高温，分干湿两季
C. 全年炎热干燥
D. 冬季温和湿润，夏季炎热干燥
3. [单选题]( )by the advances in technology, many farmers have set up wind farms on their land.
A. Being encouraged
B. Encouraging
C. Encouraged
D. Having encouraged
