阅读短文，根据首字母提示，完成单词。

    English is difficult to learn because it is so different from our mother tongue (母语). Also, we don't have

much chance to speak English with foreigners or hear English (1)s_______.

    So the first important thing for us to do, I think, is to (2)p_______ speaking English more both in and

out of class. In class I listen to the teacher carefully and (3)t_______ my best to answer the teacher's questions

in English. After class, I listen to the tapes and wonderful English songs. I often retell the texts in my own

words. I always work hard at English and (4)n_______ give up.

    Of course this is not enough. When I find something interesting, I wrote it down in English. At first, I

couldn't write well, but with the help of my teacher, I have made great (5)p_______.

张某，男，47岁，因肺炎用抗生素连续治疗，近日发现口腔黏膜有白色附着物，用棉签拭去附着物可见出血，考虑口腔病变是由于( )

A．维生素缺乏
B．凝血功能障碍
C．铜绿假单胞菌感染
D．病毒感染
E．真菌感染