单项选择题

牙牙语发展于 4-6个月，9个月达高峰期，1岁以后仍有继续，为后期说话提供了基础。
A、正确
B、错误

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单项选择题

根据闸底板结构的受力特点，闸底板是一块受力复杂的弹性薄板。
A、正确
B、错误

单项选择题

( )According to “Suwen–Valuable Theories in Gold Cabinet”, which of the following is NOT correct?
A、Comparing with day time, night belongs to Yin
B、Comparing with night, the day belongs to Yang
C、The external part of human body belongs to Yin
D、The internal part of human body belongs to Yin