单项选择题

With the help of telescopes, scientists can _________.

A．discover all stars and planets in the universe
B．gain more knowledge about the universe
C．study the craters, mountains and plains on the moon's surface
D．increase our knowledge of the earth

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热门试题

单项选择题

Through telescopes men have discovered that _________.

A．many more new groups of millions of stars remain unknown to us
B．stars are not in a single group
C．bigger and more powerful telescopes have been built recently
D．some stars are not single but in millions of groups

单项选择题

It has been _________ years since Galileo made the first telescope.

A．more than 390
B．over 350
C．about 1609
D．more than 30