多选题 Some Tibetan nomads used yak butter as a ______, one that often took the place of money in commercial transactions.

A、 reimbursement
B、 merchandise
C、 commodity
D、 formula
E、 refund
F、 register

【正确答案】 B、C

【答案解析】[解析] ●逗号说明前后同义重复。
●空格与took the place of money in commercial transactions(在贸易交流中占据通货的地位)同义重复。
●reimbursement偿还，merchandise商品，commodity商品，formula准则，refund偿还，register记录/名单。答案选BC。
●注：这里reimbursement和refund是干扰项，同表示“偿还”。