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【单选题】
中国抗日战争胜利前夕，美国在日本广岛和长崎各投下一颗原子弹，加速了日本的投降。人类利用原子能的理论基础是( )。A.
阿基米德发现的比重原理
B.
中国古代火药和火药武器的发明和应用
C.
牛顿提出的万有引力定律
D.
提出的相对论
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【单选题】The 3-year-oid boy was found _____ in the bathroom. Nobody knows how and when he _____. [ ]
A.
dying, died
B.
dead, dying
C.
dead, died
D.
died, dying
【简答题】A 篇 "I sometimes get up at three or four in the morning and I surf the Internet." "I often check my e-mail forty times a day." "I often spend more than three hours during one time on the Interne...
【单选题】对下面的程序描述正确的是( )。 #include V oid main( ) { int x=3,y=5; if (x=y-4)printf( “ * ” ); else printf( “ # ” ); }
A.
有语法错误，不能通过编译。
B.
输出 *
C.
可以通过编译，但是不能通过连接，因而不能运行。
D.
输出 #
【简答题】The world’s population is increasing at an ever-fast rate, with severe consequences for the natural environment. For example, in 1989 there were 5.3 billion people in the world, or 93 million more tha...
【单选题】Jim is outside the room. Please open the door and ___________. [ ]
A.
let him in
B.
let in him
C.
let him out
D.
let out him
【单选题】He looks sad. Let’s cheer him up .
A.
let him down.
B.
Make him happy
C.
make him pleasure
D.
disappoint him
【简答题】当三极管的发射结正偏,集电结反偏时,三极管处于()状态。
【单选题】如果三极管的发射结正偏,集电结反偏,当基极电流I B 增大时,将使三极管
A.
集电极电流Ic 减少
B.
集电极电压U CE 增大
C.
集电极电流Ic增大
D.
发射极电流I E 下降
【单选题】Bill asked his father _____ and play football. [ ]
A.
let him to go
B.
let him to
C.
to let him go
D.
to let him to go
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