阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。
People used to say that horses sweat, men
perspire(流汗), and
ladies glow. Now that most of us live a healthy lifestyle which includes
exercise, we all sweat! The main reason our bodies produce sweat is to help us
cool down. As you exercise or sit in the hot sun, your body temperature rises
and your sweat glands(腺) get to work passing liquid through your skin. When your sticky
sweat evaporates, it cools your skin and helps your body stay at a healthy
temperature.
You may think that the sweatiest people at
the gym are the ones who are out-of-shape. In fact the better shape you are in,
the more you sweat! With lots of exercise heating your body regularly, your 3
million sweat glands will grow larger so they can cool you down faster. But
it’s not all about exercise: genes determine how likely you are to sweat, and
there isn’t much you can do to change it! On a very hot day, an average person
will sweat 3 pints of liquid an hour, but someone used to the heat will sweat 8-5
pints in an hour! No wonder it’s important to drink lots and lots of water when
the sun beats down．
Staying comfortable in the heat will mean
sweating, but there are other ways to keep cool. Stay in the shade and dress in
light colors and natural fabrics like cotton. Wear a light hat that will shade
your face but will still let heat escape from your head. Drink a lot of cool
liquids to rehydrate. If you are sweating a lot, you will be losing salt as
well as water through your skin, so you may want a salty snack. Sweat is
odorless, but the bacteria that live in it can smell bad. Keeping clean will
help your friends stay friendly all summer long!
