40. Cars ______
a. have no relation to air pollution
b. make our life more convenient
2
c. do not account for air pollution
d. release no harmful smoke
B. Fill in each numbered blank with one suitable word or phrase.
We all know that jogging or running slowly (41) ______ long distances is good exercise for
our (42) ______. It helps us keep fit and (43) ______ weight, makes the heart stronger, and even
helps us (44) ______ better about ourselves. It costs almost nothing, (45) ______ a good pair of
(46) ______ to protect a jogger
's leg and feet (47) ______ the shock of the hard surfaces. A new
kind of running shoes has just been introduced. The shoes (48) ______ designed by a team of
researchers at the University of Calgary. The shoes, (49) ______ are made of special materials,
can reduce the damaging effects on a jogger's body. They may also prove to be (50) ______ in
helping elderly people to walk.
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