根据短文内容判断正误。正确的写T,错误的写 F。
Do you use your right hand more or left hand more? Very few us use both of our hands well. Most
people use right hands, only about five people of a hundred use left hands. New-born babies can take
things with either of their hands, but in about two years, they like to use their right hands. Scientists don't
know why this happens. Thcy've studied it. They think our animal ancestors used their right hands, this
may not be true. Monkeys are our closest. relation in the animal world. Scientists have found that
monkeys like to use one of their hands more than the other. but it can be either hand. There are as many
right-handed monkeys as the left-handed ones. Next time you visit the zoo and watch the monkeys
carefully. You'Il see that some of them will use their right hands and others will use their lcft hands, but
men use their right hands better and this makes life difficult for the lefthanded ones. We live in a
right-handed world.
Some scientists have found out that more of successful people are left-handed, but they don't know
why. But they are working hard to discover the secret.
( ) 1. Very few of us use both of our hands.
( ) 2. About 5% people use their left hands.
( ) 3. The left-handed live easily because most people use their left hands.
( ) 4. New-born babies use their right hands more.
( ) 5. Scientists don't know the reason why more of successful people are lcft-handed.
。
，乙没有闯关成功的概率为
。这两个事件是相互独立事件，所以甲乙两人都没有闯关成功的概率
，最后得到甲乙至少有一人闯关成功的概率
。
，