A recent Auburn University study provides some real numbers to back a theory we’ve all kno

A recent Auburn University study provides some real numbers to back a theory we’ve all known was true for some time—planting a shade tree near your home reduces energy bills significantly in the spring and summer months. The study, conducted in Auburn,
Alabama, included 160 homes with different levels of shade. Each home’s energy usage was monitored and pared to other houses with similar energy— using patterns, size, type of cooling system, etc. Here are some highlights from the study:
Houses with trees on the west side of their home had a “much lower power bill”.
Older homes had the most shade coverage, because people did not use to rely on air conditioning as much to keep them cool.
Children under age 12 consume the most power in a home as they watch television, play games and frequently leave lights on.
Fall and early winter are the perfect seasons to plant a tree. This time of year many nurseries（苗圃）are trying to reduce their inventory of trees heading into the winter, so you may find a deal on trees easily to plant around your lot.
While you have the spade out, consider planting a tree near your outside air conditioning unit. The shade will keep the unit cooler and help it operate more efficiently. Be sure to plant far enough from the unit to allow proper airflow, and account for the tree’s growth over time.
It actually hurts to watch the trees being knocked over when land developers plan neighborhoods because trees could provide much needed shade to new homeowners, reducing their electric bill and the amount of energy they consume. Hopefully this study, and more like it in the future, will encourage developers and builders to plan around trees as much as possible to offer homeowners a shaded lot.
1．What does the passage mainly tell us?
A．A new study about planting trees.
B．Planting trees to reduce your power bill.
C．Houses with trees on the west side.
D．Don't cut trees down when planning neighborhoods.
2．The underlined word inventory in Paragraph 5 is closest in meaning to     .
A．invention        B．volume      C．list          D．type
3．According to the passage,      might spend more energy cost.
A．houses with trees on the west side of their home
B．older houses with the most shade coverage
C．houses with different levels of shade
D．houses with the children under age 12
4．Which is NOT the benefit of planting a tree near the outside air conditioning unit?
A．The shade will keep the unit much cooler.
B．The shade helps the unit operate more efficiently.
C．The trees stops the unit having proper airflow.
D．The shade prevents the sunlight from shining on the unit.
5．What can we learn from this study?
A．The study is carried out by the students at Auburn University, Alabama.
B．While planning new neighborhoods, developers often cut down the trees there.
C．Houses with trees on the east side of their house had a lower power bill.
D．The study will prevent developers and builders from planning more trees.B