2.Infants go through a hard time when starting to learn a language.
A.True
B.False
C.Not Given
正确答案：B
解析：原文指出：’People have a hard time learning new languages as they grow older, but infants have the ability to learn any language easily.’ 可见婴儿学语言并不困难，故该句错误。
3.Most children speak in full sentences before they are three.
A.True
B.False
C.Not Given
正确答案：A
解析：原文明确说：’And most children speak in full sentences by the age of three.’ ‘By the age of three’ 包含 ‘before they are three’ 的语义倾向，但更关键的是后文未限定必须满三岁才开始，且结合常识及上下文，’by the age of three’ 通常理解为在三岁前已达成，且题干中’before they are three’与原文’by the age of three’在本语境中视为等价判断；标准答案为A。
4.Scientists are curious about how young children deal with figures.
A.True
B.False
C.Not Given
正确答案：B
解析：原文写的是：’how the brains of young children figure out how to communicate by using language’，其中’figure out’是短语动词，意为’弄清楚、理解’，并非指数学中的’figures（数字）’。因此该句属偷换概念，错误。
7.Babies can recognize about 6,000 sounds at around six months old.
A.True
B.False
C.Not Given
正确答案：B
解析：原文：’Studies show that, up to about six months, babies can recognize all the sounds…’ ——注意是’up to about six months’，即在约六个月之前具备该能力；而题干说’at around six months old’，此时大脑已开始聚焦常见音，丧失部分辨音能力，故该句错误。
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