2. 考研
  3. A set of genes play a role in learning to read and do math, but this ability is not just gene-driven,【C1】______schooling and hel

A set of genes play a role in learning to read and do math, but this ability is not just gene-driven,【C1】______schooling and hel

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问题     A set of genes play a role in learning to read and do math, but this ability is not just gene-driven,【C1】______schooling and help from parents are also vital【C2】______.
    Early mathematical ability and literacy are known to 【C3】______ in some families, but the genes【C4】______affect this have until now been【C5】______unknown.
    Scientists looked into a data pool called the Twins Early Development Study, which【C6】______12-year-olds from nearly 2,800 British families.
    The team compared twins and【C7】______children to see how they【C8】______in tests for maths and reading comprehension, and then matched the children’s genomes.
    Between 10 percent and half of the genes involved in reading were also involved in math, they found, and tiny variants in these【C9】______genes influence skill level.
    【C10】______it’s also clear how important our life experience is in making us better at one or the other. It’s this complex【C11】______of nature and nurture as we grow up【C12】______shapes who we are.
    Professor Robert Plomin said the study was the first to estimate the【C13】______from DNA alone on learning ability.
    But, he stressed, the genetic variants that were identified were not【C14】______"literacy or numeracy" genes.
    【C15】______they formed part of a more complex mechanism in which many genes each 【C16】______ a small, but combined, effect on learning ability.
    "Children differ 【C17】______ in how easy or difficult they find learning, and we need to recognize and【C18】______ these individual differences," said Plomin.
    "Heritability does not【C19】______ that anything is set in stone—it just means it may take more effort from parents, schools and teachers to【C20】______ the child up to speed."
【C10】
选项 A、However
B、Moreover
C、Therefore
D、Though
答案A
解析 空格所需填入的词起到承上启下的连接作用。后文提到it’s also clear．．．，似乎此处应该填入表示递进关系的B项moreover。但是回到文章开头第一段的逻辑关系，相呼应地看，此处应填入的是A项however，用来强调除了基因作用之外，外因的作用非常明显。
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