如图，某社会实践活动小组地测量两岸互相平行的一段河的宽度，在河的南岸边点A处，测得河的北岸点B在其北偏东45°方向，然后向西走60m到达C点，测得点B在点C的北偏东60°方向

（Ⅰ）求∠CBA的度数

（Ⅱ）求出这段河的宽（结果精确到1m，备用数据 $\sqrt{2}$ ≈1.41， $\sqrt{3}$ ≈1.73）

根据句子意思，写出下列句子括号内所给单词的正确形式。
The children often get ____ (noise) in the classroom after class .
Sometimes he spends his weekend____ (fish).
Several____ (foreign)came to visit our school last week.
I think the red skirt looks as ____ (good)as the green one .
John just got his____ (driver) license.
Look!Mrs Li is there. Let's go and say hello to____ (she)?
My mother often____ (enjoy) the TV plays in the evening.
Talking loudly in a library is very____ (polite).
B.根据句子意思及所给的首字母或汉语提示，写出该句子中所缺的单词。
Li Na is a famous tennis p____ .
We can’t l____ to music when the teacher is talking in class.
The children had a____  been asleep when I got home .
Mr Li is s____ with his students and makes them work hard.
Zhou Gu was____ （采访）by the local  newspaper.
There are ____ (五十二)weeks in a year.
The doctor gave him some medicine for his serious____ (疾病)。

下列对病句的修改不正确的一项是（     ）