试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
Its power is ultimately derived from the force of gravity and from the sun.（）
参考答案
正确答案：
试题解析
ultimately 根本上；originally根本上。
从根本上来说，它的能量来自重力和太阳。