题目

The reason _______ his going to Britain was ______ he got a new job there. A. for; because     B. for; that        C. of; because       D. of; that 答案：B当前两极地区的冰层正在不断变薄，其原因可能是A.全球气候变暖B.两极地区降水减少C.两极地区陆地增厚D.两极地区风速增大