D. the former is more expensive than the latter
3. According to the passage, the principle of system building is that_______.
A. construction methods are safer
B. buildings are made from a set of standardized units
C. similar buildings can be produced
D. all units are produced on the site
4. What lifts the concrete panels onto the building?
A. Cranes.
B. Man-power.
C. Pulleys.
D. Hydraulic jacks.
5. The usual fixed length in the modular system is_______.
A. twenty centimeters
B. ten millimeters
C. fifty centimeters
D. ten centimeters
参考答案:
1. C 2.A 3. B 4. A 5. D
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