单项选择题

Annie's job as an assistant at the university observatory was to classify stars according to their spectr

A．A. locateB. photographC. drawD. categorize
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单项选择题
The colors red, blue, and yellow can be mixed in different combinations to make every color the human eye can distinguish.
A．soaked
B．ranked
C．blended
D．purchased
单项选择题
The object for each player in the game of chess is to trap the other player's king into a position from which escape is impossible.
A．skill
B．aim
C．interest
D．difficulty
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