________, robots will do everything. [ ]
A. One day
B. Yesterday
C. Today
答案：A
We can change a solid _____ a liquid.[ ]
A. to
B. into
C. for
D. on
买方付息商业汇票贴现合同书包括（）
A.一方合同
B.二方合同
C.三方合同
D.四方合同
