【单选题】I found ___________ hard to remember all the twelve star signs because they are difficult to pronounce(发音) and spell.
【单选题】计算机操作系统在安装完毕后,为保证系统不受病毒破坏,下面的操作最可靠的是()
【单选题】计算机操作系统在安装完毕后,为保证系统不受病毒破坏,下面的操作最可靠的是()
【单选题】Many road signs can be found all over the world.
【单选题】Not all road signs in this world are funny.
【多选题】有关影响沉淀完全的因素叙述正确的是 ( )
【单选题】I ___ (对......感动困惑)the road signs.