单项选择题

The detective declared the mystery solved before he______.

A．found the hair
B．produced the microscope
C．searched for the murderer
D．glanced at the corpse
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单项选择题
The passage suggests that the author' s heat-pump system absorbs heat from ______.
A．soil in a nearby field
B．sun panels at ground level
C．a pipe buried next to the walls
D．a tank of propylene glycol
单项选择题
The best title for the passage is ______.
A．Preparing the Ground for a Pump System
B．Pros and Cons of the Ground-Source Heat Pump
C．The Ground-Source Heat Pump
D．It Works for Me!
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