Forget expensive educational DVDs and private tutors, the secret to smart children could be so simple as giving birth【M1】______

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问题     Forget expensive educational DVDs and private tutors,
the secret to smart children could be so simple as giving birth【M1】______
to them two years apart. Researchers who studied thousands of
children found two-year gap to be optimum in boosting brain【M2】______
power. Any shorter, and the reading and maths skills of the
older child dipped. The effect was strongest between the first
and second-born, but siblings in bigger families are also【M3】______
benefited.
    The theory comes from Kasey Buckles, an economist whose
own children are, rather unfortunately, just over two years【M4】______
apart in age. She said it is likely that the difference in
academic achievement is linked to the time and resources
parents can invest in a child before a young sibling arrives.【M5】______
    However, waiting for more than two years did not increase【M6】______
the advantage, the Journal of Human Resources will report.
Siblings with a two-year spacing include Albert Einstein and
sister Maja, and Lord Attenborough and younger brother
David. Kasey Buckles, who lead the study told the Sunday【M7】______
Times: "We believe this is the first time anyone has established
a casual benefit to increase the spacing between siblings." The
study also showed that gaps between children in larger
families was also beneficial. Buckles told the newspaper: "The【M8】______
two year gap is significant because the early years are the most
important in a child’s development so dividing your time when
the child is one is more harmful than dividing it when the
child is already at school." The effect more pronounced in【M9】______
families with lower incomes, as those with less money could【M10】______
spend to compromise for lack of time.
【M3】

选项

答案are一去掉are

解析 语法错误。此处指“大家庭中有兄弟姐妹的孩子也会因此而受益”,没有被动语义,are是多余的,故删。
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