问题
单项选择题
钡131的半衰期是（）。
A.11.5h
B.11.5d
C.11.5min
D.11.5a
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
钡131的半衰期是（）。
A.11.5h
B.11.5d
C.11.5min
D.11.5a
参考答案：B
| 完形填空 | ||||
| I enjoy doing many things in my free time, 1 drawing, fishing, reading, singing, dancing, swimming … But I like drawing best. It's one of my 2 . It takes most of my free time. In 3 , I didn't like drawing very much at the beginning. Until last summer, I went to see one of my classmates 4 he was drawing. I became interested in his 5 drawings at once. He told me 6 I practiced more, I could also draw beautiful drawings. I believed what he 7 . From then on , I 8 up my brush (面笔) and practiced drawing for one or two hours a day. I found great enjoyment in drawing. Drawing is a kind of creative work. Sometimes you can 9 the things in front of you. But sometimes you should 10 what you want to draw. As a result, it is a good way to improve our imagination | ||||
|