以mRNA为模板，合成蛋白质的过程（）
A.复制
B.转录
C.反转录
D.翻译
E.基因表达
参考答案：D
Our teacher is always busy preparing lessons until 11 o’clock at night, _____we students have gone to sleep.
A．that time
B．by which time
C．by that time
D．which time
最近，王先生买了一套住房，与某商业银行签订了一份100万元的借款合同，需要缴纳（）元印花税。
A.5
B.50
C.500
D.5000
