题目内容：

Sometimes，when you worry that you may fail an exam，you end up failing．Or during a seating arrangement （安排） in your class，when you are afraid to sit next to someone you don' t like，you end up sharing the desk with him or her．

This is what Murphy' s Law tells us： If things can go wrong，they will go wrong．But is it true？

Of the studies about Murphy' s Law，the most famous one is the buttered toast （烤面包片）phenomenon （现象）： One toast with butter falls，it lands butter﹣side down most of the time．

To prove this，Robert Matthews did a lot of experiments with more than 1，000British school kids in 2001．

In the first experiment，each student put a piece of buttered toast on a plate，let it fall off 20times and noted which side it landed on．Of almost 10，000experiments，toast landed butter﹣side down 62percent of the time．

But you may ask： Is it the butter that plays a role？ Here comes Matthews' second experiment．

This time，instead of butter，the toast had a letter "B" written on one side．It still landed 58 percent of the time on the B﹣side．

This proved that Murphy' s Law is true： If the toast can land butter﹣side down，it will do so．

Matthews did another experiment．When students threw the toast from a height of 2.5metres，the toast landed butter﹣side down only 47percent of the time．

"Toast lands butter﹣side down because humans aren' t tall enough to let it land any other way，" Matthews said．

根据上文内容判断正 （T） 误（F）

1.According to Murphy' s Law，in an English class，if you don' t want to be questioned by the teacher，you may end up failing answering the questions．

2.In the first experiment of buttered toast，we know the toast landed butter﹣side down about 620times．

3.If the toast can land butter﹣side down，Murphy' s Law is true．

4.In the first two experiments，either the butter or the letter "B" plays a role．

5.The passage is mainly talking about Murphy' s Law depends on people' s mental state（心理状态）．