问题
单项选择题 A型题
关于外毒素的叙述不正确的是（）
A.是活菌释放至菌体外的一种蛋白质
B.主要由革兰阳性菌产生，少数革兰阴性菌也能产生
C.性质稳定，耐热
D.毒性强，引起特殊病变
E.抗原性强
答案
参考答案：C
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关于外毒素的叙述不正确的是（）
A.是活菌释放至菌体外的一种蛋白质
B.主要由革兰阳性菌产生，少数革兰阴性菌也能产生
C.性质稳定，耐热
D.毒性强，引起特殊病变
E.抗原性强
参考答案：C
Complete the following passages with the words or phrases in the box. Each word or phrase can only be used once (将下列单词或词组填入空格。每空格限填一词，每词或词组只能填一次): (共8分)
小题1: means “one who offers his or her services.” There are many different ways in which people can volunteer, 小题2: taking care of sick people, working in homes for homeless children, and picking up garbage from beaches and parks. Volunteers may work within their own countries or in other countries. They are often people with a strong wish to help those who are less fortunate than themselves. Volunteers don’t 小题3: any kind of pay. At the 小题4: of volunteering is the idea that one person may have the ability to offer services that can help other people. Tracy, a good friend of mine, however, recently came back from India with a new idea of what being a volunteer means. She worked for two and a half weeks in one of Mother Teresa’s homes in Calcutta. The following is her story. |