Believe it or not，climbing is said to be about 75% legs and only 25% arms.To climb efficiently and successfully，a person needs to have a wonderful technique.One of the major rules of rock climbing is to always have three points touching the wall，whether it is both feet and one hand，or one foot and both hands，as it is much easier to have your weight rest on three points than on two.Another important idea to grasp is that your arms in most cases will not do the climbing; they only hold you into the wall so that your legs are actually pushing you upward.Also，the closer you are to the wall，the easier it is to climb.

　　Rock climbing may sound a bit too extreme for the everyday person，but it is really an amazing workout.Once you get into the sport，and learn how to position your body and rest your weight，then you can begin to deal with some difficult problems.The great thing about rock climbing is that it is mentally challenging as well.You are constantly analyzing the way your body moves and how to do certain moves on the wall.For anyone who wants to get into shape，rock climbing is a fun and effective way to exercise muscles.

　　6．What does the author think of rock climbing?

　　A．It is an easy sport.

　　B．It is challenging.

　　C．It is quite dangerous.

　　D．It is extremely difficult.

　　答案　B

　　解析　“it is not a very easy sport”表明有一定的挑战性，但并不说明相当难(extremely difficult)。

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