Question

these lights are too cool!
physical science studies: wave interactions
cities around the country
have been using some
new traffic lights. these
lights last longer and use
less energy. so cities save
money. but the bulbs
dont burn hot enough to
melt snow. this can
cause problems for
drivers.
the traffic lights use led
bulbs. these bulbs use
much less energy than
those used in most traffic lights. thats good for the
environment. its also good for cities. since the bulbs use
less energy, they last for seven or more years. other bulbs
need to be changed every 12 to 18 months.
what else is good about led traffic lights? they dont
waste energy by making heat. this is also a problem,
however. why? the lights dont melt snow. wet snow can

question 3
the news story talks mainly about ________.
a. the different u.s. cities that are using led
traffic lights
b. the good things and bad things about led
traffic lights
c. the reasons why many drivers like led
traffic lights
d. the costs for towns to put in new led
traffic lights

Explanation:

The text first mentions the benefits of LED traffic lights (last longer, use less energy, good for environment and cities). Then it points out a problem (bulbs don't burn hot enough to melt snow, which can cause problems for drivers). So it's about both good and bad things.

Answer:

B. The good things and bad things about LED traffic lights