It's necessary for us them every day．A.walkingB.to walkC.walksD.to walking 题目和参考答案——青夏教育精英家教网—

     Baseball is America's national sport. So it is not unusual that many popular expressions come from baseball.
But first, let me explain a little about the game.
     Each baseball team has nine players. The pitcher of one team throws the ball to a batter from the other team.
The batter attempts to hit the ball. If he misses, it is called a strike. If a batter gets three strikes, he loses his
turn at bat and is called out. The batter also is out if he hits the ball in the air and an opposing player catches it.
But if the batter hits the ball and it is not caught, the batter tries to run to one or more of the four bases on the
field. The batter can run to all four bases if he hits the ball over the fence or out of the ballpark. Such a hit is
called a homerun.
     Now, here are some common expressions from baseball. Someone who is "on the ball" is intelligent and able
to do a good job. But a person who "threw a curve ball" did something unexpected. Someone who "steps up to
the plate" is ready to do his or her job. A "pinch hitter" takes the place of someone else at a job or activity.
     Sometimes I have to give information quickly, without time to think it over. Then I would say something
"right off the bat". If someone is doing an extremely good job and is very successful,you might say he or she is
"batting one thousand."
    If I say I want to "touch base" with you, I will talk to you from time to time about something we plan to do.
I might say I "touched all the bases" if I did what is necessa- ry to complete a job or activity. And if I "covered
my bases" I was well prepared. However,someone who is "way off base" did something wrong or maybe even
dishonest or immoral. A person with strange ideas might be described as "out in left field".
     Finally, when a situation changes completely, we say "that is a whole new ballgame."

It's necessary for us ________ them every day．

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