If all the plants on the earth die, people animals will be able to live.
A. neither; nor
B. both; and
C. not only; but also
D. either; or
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(答案→)A. neither; nor
B. both; and
C. not only; but also
D. either; or
解析：Both; and 两个都，既……又……；Not only; but also不但……而且……；Neither nor两者都不，既不是……也不是。Either; or要么……要么……；两个都，既……又……；句意：如果地球上所有的植物都死了，人和动物都不能活。故选A。