问题
单项选择题
夏天高压蒸汽灭菌后的无菌包，保存有效期最长时间不能超过（）
A．3天
B．14天
C．28天
D．7天
E．21天
答案
参考答案：D
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夏天高压蒸汽灭菌后的无菌包，保存有效期最长时间不能超过（）
A．3天
B．14天
C．28天
D．7天
E．21天
参考答案：D
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| If you are human, you can't help but experience times when everything seems to be going wrong. You must also _1_as if your life is completely out of control at times. It is during those "down times" that words of encouragement from family, friends, co-workers or 2_strangers can boost(增强)your spirits. It is also during those _3_that negative words can be devastating (毁灭性的) and sink you deeper and deeper into depression. For example, consider this story about a group of _4_who were traveling through the woods when _5_of them fell into a deep pit (坑). All of the other frogs gathered around the _6_.When they saw how _7_the pit was, they told the two _8_frogs they would never get out. The two frogs didn't obey what other frogs said and tried to _9_ out of the pit. The other frogs kept telling them not to jump, _10_ it was in vain. Finally, one of the frogs followed what the other frogs were saying and simply _11 . He fell down and _12 . The other frog continued to jump as _13_as he could. Once again the crowd of frogs shouted at him to _14_ the pain. The more they _15_, the harder he jumped and finally he _16_to safety. When he _17 , the other frogs asked him why he continued to jump when they were all _18_ him to simply quit. The frog _19_to them that he was a little bit deaf. He thought they were _20_ him all the time. | ||||
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