Fix randomization bug with Question.js.
Fix randomization bug with Question.js.

wenru/ibex,addrummond/ibex,addrummond/ibex,wenru/ibex,wenru/ibex,wenru/ibex,hlplab/hlpspr1,addrummond/ibex,hlplab/hlpspr1,addrummond/ibex,hlplab/hlpspr1