社会救济保障的对象是( )的公民。
A．城乡中无依、无靠B．城镇中生活困难C．地处贫困地区、生活无保障D．城乡中的灾民和生活发生严重困难
参考答案：D
—________ does it take to get to Beijing?
—Nine hours.[ ]
A. How often
B. How soon
C. How long
D. How much
Boraginaceae的化学成分类型是萘醌类色素和生物碱。( )
