When they get..........(1), most animals move about and search for food, They fly, crawl, swim, hop, walk or run. Some animals are ..........(2) to move about and therefore must wait for food to come to them. If an animal..........(3) get food, it will die.
Most plants cannot move about to search for food. They cannot fly, crawl, swim, hop, walk or run. Their..........(4) hold them firmly in the soil. Yet they are..........(5) to keep growing and seem to have plenty of food.
For a long time people believed that plants..........(6) only soil for food. A..........(7) thoughtful people noticed that plants..........(8) grew in pots did not seem to use up the soil. No matter..........(9) large such plants became, the amount of soil in the pots remained about the..........(10). This was very puzzling.
At last a man thought of an experiment to find out..........(11) plants use soil for food. He placed a pot of soil in the oven. He heated it until the water was driven of and the soil was very..........(12). Then he weighed the pot of soil very carefully and wrote down its exact..........(13). Next he..........(14) some seeds in the soil, and gave them plenty of water. When the seeds had..........(15) into large plants, he removed these plants, roots and all,..........(16) the pot. He..........(17) the pot of soil again and weighed it. It weighed only a very little less than it..........(18) before. The plants had gained a great..........(19) in weight, but the soil had..........(20) only a very little in weight.
1.hungry 11.whether/if
2.unable 12. dry
3.can't 13.weight
4.roots 14.planted
5.able 15.grown
6.use 16.from
7.few 17.
8.which 18.did
9.how 19. amount
10.same 20.lost
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When they get
hungry, most animals move about and search for food, They fly, crawl, swim, hop, walk or run. Some animals are
unable to move about and therefore must wait for food to come to them. If an animal
can't get food, it will die.
Most plants cannot move about to search for food. They cannot fly, crawl, swim, hop, walk or run. Their
roots hold them firmly in the soil. Yet they are
able to keep growing and seem to have plenty of food.
For a long time people believed that plants
used only soil for food. A
few thoughtful people noticed that plants
which grew in pots did not seem to use up the soil. No matter
how large such plants became, the amount of soil in the pots remained about the
same. This was very puzzling.
At last a man thought of an experiment to find out
whether plants use soil for food. He placed a pot of soil in the oven. He heated it until the water was driven of and the soil was very
dry. Then he weighed the pot of soil very carefully and wrote down its exact
weight. Next
he planted some seeds in the soil, and gave them plenty of water. When the seeds had
grown into large plants, he removed these plants, roots and all
from the pot. He
dried the pot of soil again and weighed it. It weighed only a very little less than it
had before. The plants had gained a great
deal in weight, but the soil had
lost only a very little in weight.