问题
单项选择题
关于外毒素，错误的是()
A．大多由革兰阳性菌合成
B．细菌生长繁殖过程中即可释放出来
C．抗原性弱
D．毒性强
E．可制成类毒素
答案
参考答案：C
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关于外毒素，错误的是()
A．大多由革兰阳性菌合成
B．细菌生长繁殖过程中即可释放出来
C．抗原性弱
D．毒性强
E．可制成类毒素
参考答案：C
To celebrate the end of our exams, my friends and I went to a fast food restaurant. We ____ hamburgers and Coca Cola at the counter. When our ____ came, I started walking towards an empty table. By bad luck, my purse strap(带子) got ____ on a chair and the tray(托盘) that I was holding slipped ____ my hands and went flying in the air. The tray, and its contents, ____ on a man who was just about to ____ a bite of his sandwich. I stared, greatly ____， as the drinks soaked(浸湿) his white shirt. Then I ____ my eyes and prepared myself for his burst of ____. Instead, he said “It's OK” to ____ me before he disappeared into the washroom. Still shaky and unsure ____ to do next, my friends and I went to a table and sat there, trying our best to look ____. A moment later, the man came out of the washroom and ____ our table. My heart almost stopped ____. I thought he was going to ask for my father's ____ and call him. To my surprise, he merely smiled at us, handed us some cash and said, “____ yourself new hamburgers.” He then walked ____ without even finishing his food. He could have made what was already an uncomfortable situation worse, ____ he chose a different way and gave us a reason to believe that there is still ____ in this world. I'll never ____ his actions.
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