填空题
How long have astronomers studied the planets and other objects in space
【参考答案】
Thousands of years.
点击查看答案
相关考题
-
单项选择题
According to Lemaitre, the separate galaxies formed ().
A. during a pause in the expansion of the universe
B. at the time of the primeval explosion
C. and will continue to form for ever
D. when all the matter in the universe was all concentrated in one small mass -
单项选择题
Where was George Orwell born().
A. Spain.
B. America.
C. Burma.
D. India. -
填空题
32().
