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【单选题】
地球在宇宙中处于( )的位置,它得天独厚,生机勃勃,养育了数千万生物物种,在方圆10光年之内绝无仅有。
A.
宇宙的基层
B.
宇宙的中心
C.
宇宙的边缘
D.
银河系的核心
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Community College Squeeze Eighteen-year-old Jenna Tibbitts has a near-perfect GPA(Grade Point Average), and her parents can afford to send her to the four-year university of her choice. But the New Je...
A.
There are fewer unemployed workers.
B.
The recession drives people to get training early.
C.
There are more fresh high-school graduates.
D.
There are fewer adult students for additional training.