—Where did you get this book?

—Oh, I ______ it in the bookshop when I was looking for another one.

A．came across

B．found out

C．looked for

D．came up

某建筑桩基穿过未充分固结的新近填土层，并以填土层的下卧层为桩端持力层。当其他条件相同的情况下，下列（）项作为桩端持力层时，某桩承受的下拉荷载最大。（）

A.黏性土

B.红黏土

C.砂土

D.微风化砂岩