I just celebrated my 95th birthday last week, and people always ask me about my secret. Of course, it's important to eat right and exercise, but that's not much of a secret. I actually have quite a few friends over the age of 90, and we all say the same thing: laughter. Are we telling jokes all the time? Not necessarily. Are we watching funny movies around the clock? Of course not. Do we take the time to laugh at ourselves and generally try to keep things light as much as we can?  Certainly.  One of the best ways to make sure you laugh every day is to be around children or pets because they just can't help being funny! And what about those polite little laughs when your neighbor tells a joke that isn't really funny, but you laugh anyway? Those are fine, but the ones where you laugh with your whole body and mind are the ones where you end up tired and out of breath, where everyone around you starts laughing, too. My “senior” friends and I even came up with a nice round number: For each full “belly laugh” you have, you'll live one extra hour in your lifetime. Now that might not sound like much, but if you have one every day, you'll live an extra three or four years. I try to have between five and ten of those laughs every day, and so should you.
45．What is the talk mainly about?
A．The benefits of laughing.
B．Different funny things in life.
C．The balance of body and mind.
D．Celebrating the writer's 95th birthday.
46．What does the writer suggest people do？
A．Watch too many funny movies.
B．Spend time with children and pets.
C．Tell jokes with their funny neighbors.
D．Take part in birthday parties.
47．What's the effect of full belly laughs？
A．To live longer.
B．To entertain others.
C．To make the belly smaller.
D．To make more friends.
 
45．A46．B47．A