下列属癌基因(onecgene)的是()
A．p53
B．N-ras
C．bcl-2
D．c-erbB-2
E．N-myc
参考答案：B, C, D, E
D/P·T/R是指( )。
A．付款交单
B．承兑交单
C．付款交单凭信托收据借单
D．开证人担保
Last night he had a bed to sleep _____, but I had only a chair to sit _____.[ ]
A. in; on
B. /; /
C. on; in
D. in; to
