问题
填空题
看图，读短文，在空格处填入正确的单词。
I am a big 1 . I'm from 2 ; now I'm in the US. I am four years 3 . My 4 is black and white.
Bamboo(何子) is 5 favorite food. I’m very shy.
I am a 6 . I'm 7 Africa, I like meat very much. People think I am 8 because I sleep and relax
20 hours every day. Many people think I'm scary.
答案
1. panda
2. China
3. old
4. color
5. my
6. lion
7. from
8. lazy
cm。求：
cm，为使微粒不会由磁场下边射出，该匀强磁场的磁感应强度B至少多大？ 