(单选题)
The underlined word “they” in paragraph 6 refers to.
A.human beings
B.other plants
C.space technologies
D.industrial development
参考答案:A
参考解析:
词义猜测题。根据倒数第二段第四句“Space technologies are not to be developed for building a base on Mars so that one day all human beings can migrate to the red planet because they have destroyed Earth”可知,太空技术的发展不是为了在火星上建立一个基地,以便有一天所有的人类都能迁移到这个红色的星球,因为人们已经毁灭了地球。由此可知,they指代前面的all human beings。故选A。
知识点: