单选题
What can be concluded from the second and third paragraphs?
A、
A number of scientists found genes in the 18th and 19th centuries.
B、
Scientific discoveries were made one after another in the 18th and 19th centuries.
C、
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.
D、
It took a long time for scientists to find out why members of the same family look like each other.
【正确答案】
B
【答案解析】
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