逆转录
参考答案：以RNA为模板合成DNA的过程。
Stay away from junk food, please. It's bad for us, ______ for children! [ ]
A. possibly
B. especially
C. probably
D. specially
根据规定，建设单位在工程师确认计量结果( )天内支付承包商工程进度款。
A．7B．14C．15D．28
