13．
In America，90% of the people are right-handers，while only 10% are left-handers．So almost everything is designed for right-handers．But how do you know you are a left-hander or a right-hander？If it's convenient for you to play the guitar，you are a right-hander．If you are a left-hander，the situation is quite the opposite．The hand that you often use is called dominant（占支配地位的） hand．
Perhaps you've known this since you were very young．But you may not know you also have an eye and side of your brain that are dominant．
There's a test named"Bright"for the eyes．Hold one arm straight out from the middle of your body．Use your first finger to point at something far away．First look at the finger with both eyes open．Then close your right eye and look at your finger with your left eye．If your finger seems to stay in the same point，you are left-eyed．
But it is a little harder to find which side of your brain is dominant．It depends on how you hold your pencil．As for right-handers，if your right hand is straight and the pencil points outside，you are left-brained．If your right hand is hooked（彎曲的） and the pencil points inside，you are right-brained．Left-handers，opposite．
If you want to know yourself better，there are more less birh left and right．You may have a try．
根據(jù)短文內(nèi)容，選擇最佳答案．
51．In America，D of the people are left-handers．
A.90% B.40% C.70% D.10%
52．C are designed for right-handers．
A．Several B．A few things C．Most things．D．All things
53．It is not convenient for left-handers to play theB．
A．drum B．guitar C．Eyes D．Piano
54．In"Bright"test for theC，you use your first finger to point at something far away．
A．feet B．hands C．eyes D．a(chǎn)rms
55．As for right-handers，D，you are left-brained．
A．if you can write down your name on a piece of paper
B．if your finger stays in the same point when you look at it with one of yourself
C．if you can hold your arm straight out from the middle of your body
D．if your right hand is straight and the pencil points outside when holding your pencil．
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