With new technology, pictures of underwater valleys can be taken color.
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推荐题目
(2013·高考新课标全国卷Ⅰ)It was a real race________time to get the project done.Luckily，we made it.
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over
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The large grassland, reaching out far away, looks extremely beautiful _______ the blue and clean sky.
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—How amazing it is that astronauts are exploring outer space!—It's a challenge, I guess, ______ man against nature.
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The lab is equipped _____ a lot of modern equipment for medical experiments.
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