高等教育 / 大学英语4
(单选题) What does the underlined word “This” in paragraph 3 refer to?
A、A satellite.
B、A little rocket.
C、A satellite seems to stay in the same place in the sky.
D、The satellite puts the rockets in the right position.
A、A satellite.
B、A little rocket.
C、A satellite seems to stay in the same place in the sky.
D、The satellite puts the rockets in the right position.
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