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A number of scientists found genes in the 18th and 19th centuries. Scientific discoveries were made one after another in the 18th and 19th centuries. Many scientists succeeded in finding out how the features of living things were passed on to the next generation in the 18th and 19th centuries. It took a long time for scientists to find out why members of the same family look like each other.
Poor；rich The poor；rich Poor；the rich The poor；the rich
whatever Whenever however Wherever
Whatever Whenever However Wherever
from the 25th to the 31th of May from the 20th to the 31th of May from the 21th to the 31th of May from the 16th to the 31th of May
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a; 不填 the; the a; the 不填；the
How often How soon How long How many
from the 11th to the 20th of May from the 15th to the 25th of May from the 10th to the 20th of May from the 16th to the 31st of May
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