问题
单项选择题 B1型题
上述各项，属重复感染的是（）
A.初次感染某种病原体
B.在感染某种病原体基础上再次感染同一病原体
C.人体同时感染两种或两种以上的病原体
D.在感染某种病原体基础上又被其他病原体感染
E.原发感染后出现的病原体感染
答案
参考答案：B
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上述各项，属重复感染的是（）
A.初次感染某种病原体
B.在感染某种病原体基础上再次感染同一病原体
C.人体同时感染两种或两种以上的病原体
D.在感染某种病原体基础上又被其他病原体感染
E.原发感染后出现的病原体感染
参考答案：B
| 从方框中选择适当的单词，并用其正确形式填空，补全下面的短文 | |
a timetable and organize (组织) what you are going to do. Then you will not (3)_____ bored (无聊的) during the long summer holiday! Here are what some (4)_____ do during their long holidays: ◆ (5)_____ pictures or make something. ◆ Listen to music. ◆ Visit friends. ◆ _____. ◆ Play sports in the park with friends. ◆ Write some short (7)_____. ◆ Help parents do the housework. ◆ (8)_____ how to cook. ◆ Go to the movies, watch TV or play on the computer. I (9)_____ these ideas are helpful (有帮助的) to you. Stay happy during your long holiday and (10)_____ your holiday activities. |