问题
单项选择题
急救复苏时，胸外心脏按压次数与人工呼吸的比例是
A．15:2
B．15:4
C．12:4
D．18:2
E．12:2
答案
参考答案：A
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急救复苏时，胸外心脏按压次数与人工呼吸的比例是
A．15:2
B．15:4
C．12:4
D．18:2
E．12:2
参考答案：A
| 根据句意，用所给单词或短语的适当形式填空。（每词或短语只限使用一次） | |
2. Nancy often __________ with her friends in summer. 3. The father was __________ of his son's efforts at school. 4. Students are __________ to share their thoughts by teachers. 5. Many schools hold several __________ of music or sports every year |