单项选择题

Critical period hypothesis states that if humans do not learn a foreign language before a certain age, then it becomes impossible to learn a foreign language like a native speaker due to changes such as maturation of the brain. ( ) A. 对 B. 错

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判断题

Government bonds has greater default risk relative to corporate bonds.

答案: 错误
问答题

直线分为[填空1]、[填空2]和各种角度的[填空3]。

答案: 第1空:垂直线  第2空:水平线  第3空:斜线
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