题目内容：

    To joke around is to have fun with someone. To fool someone is to try to make them believe something that is not true. 1.

April 1st is known as the day to fool people with practical jokes, pranks or harmless tricks. 2. Some say April Fools' Day began as one big mistake.

Many centuries ago, people in the Western world used the Julian calendar. 3. However, when people began using the Gregorian calendar, the New Year was moved to January 1st. Those who forgot the change and tried to celebrate New Year's Day on the wrong date were teased and called ''April fools''. This is just one of the many theories behind the origin of April Fools' Day. 4.

The fool is a common character in art, music and literature. William Shakespeare is famous for his fools. And fools make for great pop songs. Fools are found in many words, expressions and proverbs. To be foolhardy means to do something that are too dangerous or risky. For example, it is foolhardy to hike up a mountain during a heavy snowstorm. If something is foolproof, it is planned or made so well that nothing could go wrong. 5.

''Look, I don't want to get into trouble. This plan of yours sounds risky. ''

''My plan is foolproof. Nothing will go wrong as long as you do exactly as I say. ''

A.Not even a fool could mess it up.

B.And that is the purpose of April Fools' Day.

C.They celebrated the New Year on April 1st.

D.Even a smart person can be a fool at times.

E.But the tradition remains the same—to fool someone.

F.Fools also find themselves in many proverbs.

G.But how did this tradition begin?