如图所示，参考系B相对于参考系A以速度v沿x轴正向运动，固定在参考系A的点光源S

—Is Tom still smoking? 

—No．By next Saturday he _____________ for a whole month without smoking a single cigarette.

A．will go

B．will have gone

C．goes

D．has been going

党参的味

A．极苦
B．苦
C．甜
D．微甜
E．涩

There is so much noise in the yard that I can't ________ my attention on my work. [      ]

A. attract  

B. pay    

C. absorb  

D. concentrate

关于CIN的论述，不恰当的是

A．级别越低，自然退缩的机会越多

B．根据病变侵犯上皮的程度分为三级

C．宫颈原位癌是指原发于宫颈的癌症

D．Ⅲ级包括重度不典型增生和原位癌

E．是宫颈癌的癌前病变

体验营销的体验形式的几个环节构成是什么？