判断题

抬头抓泳手臂入水后肘部可以下沉。()

答案：错误

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单项选择题

隐性斜视表现为()。

A)3△
B)2△
C) 1△
D) 4△

Mary is always ready to do some __________ work at the local geracomium（~t~]~） in her spare time.
responsible
B. exhausting
C. voluntary
D. professional