【单选题】【消耗次数:1】
Although they plant trees in this area every year, the tops of some hills are still ______.
blank
hollow
vacant
bare
参考答案:
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相关题目
【单选题】 — Its very windy and dusty in Beijing . —Well, more trees______ every year to stop the wind and sand.
①  should plant
②  should planted
③  can planted
④  must be planted
【单选题】 14.We should plant trees on _______ side of the road.
①  each
②  some
③  every
④  many
【单选题】 Although the weather was very bad, the buses still ran on ____.
①  time
②  plan
③  schedule
④  arrangement
【判断题】 Thousands of trees?were planted?last year.
①  正确
②  错误
【单选题】 Every year, one student in our high school wins a scholarship that ____one year of college.
①  improves
②  subsidizes
③  obliges
④  inflicts
【判断题】 In some countries girls are still ___deprived___ of a good education.
①  正确
②  错误
【单选题】 16.-This dress was last year’s style. -I think it still looks perfect ______ it has gone out this year.
①  so that
②  even though
③  as if
④  ever since
【单选题】 Niagara Falls is a great tourist _____, drawing millions of visitors every year.
①  attention
②  attraction
③  appointment
④  arrangement
【单选题】 There are some areas which are still densely populated ____ their severe weather conditions.
①  due to
②  with regard to
③  regardless of
④  but for
【单选题】 Would you like some more coffee? There’s still _______ left.
①  a few
②  few
③  a little
④  1ittle
随机题目
【单选题】 理想电压源输出的电压值恒定,输出的( )由它本身和外电路共同决定。
①  电压值
②  电流值
③  频率
【单选题】 电容元件的正弦交流电路中,电压有效值不变,当频率增大时,电路中电流将( )
①  增大
②  减小
③  不变
【单选题】 已知工频电压有效值和初始值均为380V,则该电压的瞬时值表达式为( )。
①  u=380sin314tV
②  u=537sin(314t+45?)V
③  u=380sin(314t+90?)V
【单选题】 在电阻元件的正弦交流电路中,伏安关系表示错误的是( )
①  u=iR
②  U=IR
③  ù=?R
【单选题】 电感元件的正弦交流电路中,电压有效值不变,当频率增大时,电路中电流将( )
①  增大
②  减小
③  不变
【单选题】 电感是( )的元件。
①  储存电场能量
②  储存磁场能量
③  耗能
【单选题】 实际电压源模型“20V、1Ω”等效为电流源模型时,其电流源IS=( )A。
①  20
②  1
③  21
【单选题】 已知电路复阻抗Z=(3-j4)Ω,则该电路一定呈( )
①  感性
②  容性
③  阻性
【单选题】 下列说法中,( )是正确的。
①  串谐时阻抗最小
②  并谐时阻抗最小
③  电路不谐振时阻抗最小
【单选题】 一电阻R上 U、I 参考方向不一致,令 =-10V,消耗功率为0.5W,则电阻R为( )
①  200Ω
②  -200Ω
③  ±200Ω