-Sorry,I'm not feeling well and I don't think I can finish.    

-Don't worry. Let us do it for you,_____?    [ ]

A. will you        

B. shall we      

C. shan't we        

D. shall you

能加速学习，延长记忆的内分泌激素是（）

A.5-羟色胺

B.促肾上腺皮质素

C.去甲肾上腺素

D.肾上腺素

E.血管加压素