【单选题】From this passage we know that ______ .
A.
we can learn English easily
B.
English is too difficult to learn
C.
English is a useful language but one must work hard to learn it
【单选题】交流电源的频率对人体危害最大的是____。
【单选题】如果需要的图书已经被其他读者借走,同学们可以?
【简答题】From this passage we learn that an invention will not benefit the inventor unless ______ .
【判断题】海洋环境污染损害具有污染源多、分布广泛、危害后果严重、扩散范围大和可与环境隔离等特点。判断对错
【单选题】柏拉图认为,诗人在灵感来临时处于( )。