单选题The government is _____&n

问题补充：

单选题Thegovernmentis_____andwilltakethenecessarystepstomaintainsecurityandstability.A.on the alertB.out of controlC.on guardD.in vain

答案：

A解析on the alert (=alert; watchful; careful) 警惕，小心：Drivers must be on the alert for traffic signals. (=Drivers must be especially careful to see signals when driving a car.) (司机必须密切注视交通信号。)out of control 失去控制；on guard站岗；in vain 徒劳，无效。