多项选择题：地震波的（）和（）是其动力学信息，用来确定围岩波阻抗变化，确定界面两侧围岩力学性质变

题型：多项选择题

Without plants, people could not live. We eat plants. We take in oxygen that plants make. And we need plants for another reason: We need them because they are beautiful.

Imagine a world with no plants. Imagine no flowers with their sweet smells, their beautiful colours and their lovely shapes. Imagine, when the wind blows, we are not able to hear the leaves of the trees or watch the branches swing from side to side.

Everywhere people need beautiful plants. That is why we have parks full of trees and flowers. That is why people always like houses with room for some grass and a garden.

Do you talk to your plants? Do you give them love and take good care of them? Peter Tompkins and Christopher Bird, writers of a book called The Secret of Plants , tell of an experiment in which two seeds were planted in different places. While the plants were growing, one plant was given love and hopeful ideas. After six months, the beloved plant was bigger. Under the earth it had more and longer roots; above the earth, it had a thicker stem and more leaves.

68.In the experiment, the two plants were _____.

A.treated in two different ways

B. of different kinds

C. both given love and taken good care of

D. grown in the same place

69 At the end of six months________.

A. the plants were of the same size

B. one plant had longer roots than the other

C. one plant had longer roots; the other plant had a thicker stem

D. one plant had a thicker stem; the other plant had more leaves

70.Tompkings and Bird believe that plants________

A. can talk to each other

B. can take care of each other

C. should be grown in different places

D. need love and care

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地震波的（）和（）是其动力学信息，用来确定围岩波阻抗变化，确定界面两侧围岩力学性质变

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