【单选题】If these new methods don’t work,we’11 have to__________our old system.
【单选题】使用 “文本(Text)”工具不能完成的操作有
【单选题】我国于( )年建立了全国导游人员资格考试制度。
【单选题】The first snow didn't fall until February in our province this year, _____ was unexpected. [ ]
【单选题】关于口径场相差对天线的影响,下列说法正确的是:【】
【单选题】To have a better future for the environment, we shall fall back on ______.
【简答题】The temperature will fall sharply the day after tomorrow,when a snowstorm____to strike our area. A.expects B.has expected C.is expected D.will be expected