举一反三
- A full understanding of mathematics is sufficient to explain a wide variety of natural ____________.
- The more trees we plant, _________________. A: the better is the environment. B: the better the environment is. C: the environment is better. D: The environment better is.
- With the plentiful and variety of biology species, Mount Huangshan has become a World Natural and Cultural Heritage site.
- _________ is the process by which living species become gradually modified and adapted to their environment in more and more sophisticated ways.
- The environment is the natural world of land, sea, air, plants, and _________. It is the sum total of all surroundings of a living organism, including natural forces and other living things, which provide conditions for development and growth.
内容
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___ methods of farming use only natural animal and plant products to help the plants grow healthy, rather than using chemicals.
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What is the niche? A: The role or function of a particular species B: A place in where the individuals of population live C: An animal population living in the forest D: A group of populations living together
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A ______ is a small animal or plant that lives on or inside a larger animal or plant, and gets its food from it.
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Every ten minutes, one kind of animal, plant or insect______ for ever. If nothing is done about it, one million species that are alive today will have become extinct twenty years from now.
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In order to make a living in the harsh environment, the _______ men made many tools from stones and animal bones. A: barbarous B: brutal C: primitive D: inhuman