可引起日本血吸虫病最严重病变的是以下哪一项（）
A.虫卵
B.毛蚴
C.童虫
D.毛蚴和成虫
E.成虫和虫卵
参考答案：A
用所给词的适当形式填空。
1. Jack is a kind young man. He is very _____ (help) and people all like him.
2. We have sports _____ (two) a week.
3. Today is my _____ (one) day at school. I'm happy to see my new classmates.
4. The shop is _____ (close) at this time of the day.
5. Nick loves swimming. He is a good _____ (swim).
6. Sometimes we have dinner at my _____ (grandparent) home.
水压试验水温与环境温度宜在（）℃以上，或根据厂家说明书的要求进行。
A.0
B.5
C.10
