为了使教室内的学生上课免受周围环境噪声干扰,下面哪个方法有效合理()
A:在教室内安装噪声监控器装置
B:在教室周围植树
C:每个学生都戴个个防噪声耳罩
D:将教室的窗户打开
根据短文内容,选出一个最佳答案填入题前的括号内。
Name
Personal Information
Norman Bethune
Born in 1890 in Canada
A doctor
Came to China in1938
Died in 1939 in China
Celine Dion
Born in Montreal, Canada
A singing star
In 1997, sang My Heart Will Go On for the film Titanic
Thomas Edison
Born in 1847, Kentucky, USA
Made over 1,000 inventions
Died in 1931
Bill Gates
Born in 1955 in the USA
Wrote Business @ the Speed of Thought
Owns Microsoft Company
Mark Twain
Born in 1835 in the USA
A writer
Wrote the Adventure of Tom Sawyer
Died in 1910
由实验1、2可验证猜想____(选填“A”或“B”)正确,并可得到的结论是:____.