质粒是细菌的
A．核质RNA
B．胞浆中的异染颗粒
C．核质DNA
D．染色体外的DNA
E．胞浆中的RNA
参考答案：D
Li Lei often goes to school ______ 7:30 in the moming.[ ]
A. at
B. for
C. on
D. of
金融市场体系
