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【单选题】
如图,某地修建高速公路,要从B地向C地修一座隧道(B,C在同一水平面上),为了测量B,C两地之间的距离,某工程师乘坐热气球从C地出发,垂直上升100m到达A处,在A处观察B地的俯角为30°,则BC两地之间的距离为A.
100 m
B.
50 m
C.
50 m
D.
m
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【单选题】John was a clever boy, but his parents were poor, and he had to work in his spare time and during his holidays to pay for his education. Despite this, he managed to go to university, but it was so exp...
A.
studying in the university
B.
working in a butcher's shop
C.
doing two jobs
D.
cutting meat well
【单选题】John was a clever boy, but his parents were poor, and he had to work in his spare time and during his holidays to pay for his education. Despite this, he managed to go to university, but it was so exp...
A.
studying in the university
B.
working in a butcher's shop
C.
doing two jobs
D.
cutting meat well
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【单选题】Dick was a clever boy, but his parents were poor, so he had to work in his spare time and during his holidays to pay for his education.【21】this ,he managed to get to the university, but it was【22】expe...
A.
Although
B.
In spite of
C.
No matter
D.
Though
【简答题】Bob was a clever college student, but his family was poor, so he had to work after class and during his holidays to get enough money for his studies. One summer he got a job in a butcher’s shop during...
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