The difficulty in constructing tall buildings in the 19th century lies in
A. the shortage of money.
B. the lack of a device to carry people upward.
C. backward technology.
D. mountains taking up land space.
A．mattersB．aimsC．objectsD．problems
A. matters
B. aims
C. objects
D. problems
What has Volvo developed？
A. The same detection system mentioned in the previous paragraph.
B. A breathalyzer attached to a car's seat belt.
C. A smart car seat belt.
D. An intelligent engine.
Hercules finally managed to get the apples By defeating Atlas.
A. Right
B. Wrong
C. Not mentioned
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