RNA聚合酶对弱终止子的识别需要专一的终止因子。 ( )
参考答案:对
Mr. Rod prefers a restaurant in a small town to _______ in so large a city as Beijing.
A.it
B.one
C.that
D.this
粉末投入水中在水面旋转并呈黄色线状下沉而短时间内不扩散的药材为
A.红花B.西红花C.牛黄D.麝香E.熊胆