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To tie itself safely to a new home, a mussel must ______A.produce a thread to anchor to th
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The transgenic farm animals mentioned in this passage are ______.A.pigs, cows and mosquito
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A small percentage of the grain ______ruined by the prolonged rain.A. wasB. isC. wereD.
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According to the Cereal Systems Initiative, the grain yields will increase______by each ye
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You may look at a group of cows ____ under the trees.A: stoodB: standsC: standingD: to
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____________, Miss Brown decided to take a taxi.A、She thought she must be lateB、Being th
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Mankind must first of all eat, drink, have shelter and clothing______ it can pursue politi