下列化合物进行一元溴代反应最容易的是( )
A. 甲苯
B. 苯甲酸
C. 苯
D. 溴苯
E. 硝基苯
下列化合物进行一元溴代反应最容易的是( )
A. 对二甲苯
B. 对苯二甲酸
C. 甲苯
D. 对甲基苯甲酸
E. 间二甲苯
The mine once had a rich _____of silver, but in petered out.(逐渐消失)
A. vent
B. veil
C. vain
D. vein
Don't touch the rosebusehes growing by the roadside because they have a lot of______.
A. thrills
B. thorns
C. throats
D. thrusts