中国大学MOOC: The ______ needs of all animals are food, water, air and protection from their enemies.
primary
举一反三
- The ______ needs of all animals are food, water, air and protection from their enemies. A: previous B: primary C: preliminary D: prior
- How is food for plants made Food for plants is made ______. A: from water B: from the air in the sky C: from the soil D: from water, things in the soil and air and sunlight
- 中国大学MOOC: Air, food and water are _________ to life. 空气﹑ 食物﹑ 水都是生命不可或缺的。
- 中国大学MOOC: IIdentify the topics from A, B, and C1. A growing number of people feel that animals should not be exploited by people and that they should have the same rights as humans, while others argue that humans must employ animals to satisfy their various needs, including uses for food and research.
- 中国大学MOOC: Air is to human _______ water is to fish.
内容
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中国大学MOOC: ____ serve(s) as a food and air passageway.
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The air spaces in the floor of an inflatable liferaft will provide protection against（）. A: asphyxiation from CO<sub>2</sub> B: loss of air in the sides of the raft C: rough seas D: cold water temperature
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Malaria comes from Italian, which means A: Bad water source B: Bad air C: Bad food D: Bad soil
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中国大学MOOC: Without sunlight, air and water, plants on the earth _____ well.
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中国大学MOOC: The project of railway switch snow protection system based on the principle of the air umbrella, was the second prize winner of the: