Daylight savings is a system of setting clocks 1 or 2 hours ahead. This causes sunrise and sunset to happen at a later hour. Daylight savings results in an extra hour of daylight in the evening. This idea was first jokingly mentioned in an essay by Benjamin Franklin in 1784. British builder William Willet wrote seriously about the idea in 1907.
Daylight savings has been used in the U. S. and many European countries since World War I. The system was started to conserve fuel needed to get electric power. Homes and businesses did not have to turn their lights on as early. Some places in the U. S. went back to standard time after the war.
During World War II, U. S. Congress passed a law putting the whole country on "war time." This set the clocks ahead 1 hour for the rest of the war. The Uniform Time Act in 1966 set up a daylight savings schedule for most of the U. S. Each state voted on whether the state would follow daylight savings time.

What is the main idea of this passage?
A.
the people who invented daylight savings time
B.
what daylight savings time is and why we use it
C.
how daylight savings time helps conserve fuel
D.
how to set the clocks for daylight savings time

B.  what daylight savings time is and why we use it

Explanation:

The first paragraph starts out by explaining exactly what daylight savings time is. It then goes on to explain the reasons (conserving fuel, saving energy, wartime measures) throughout the second and third paragraphs.

Why not A: This does not focus on people; it only mentions 2 people in the first paragraph, and not in the 2nd and 3rd paragraphs.

Why not C: It doesn't explain how it conserves fuel throughout the passage, so this is incorrect.

Why not D: This is never explicitly explained.

what are the answers?

laughter improves people's emotional and well-being.   kavita khajuria is a psychiatrist and he has defined laughter as " physical expression of humour and joy that has numorous protective qualities." when you feel under stress or sad because you have argued with a person you love, you need to laugh to feel strong enough to face the problems.

when you have an exam , you probably feel under stress. laughing will you release this tension. humour decreases the hormones that cause stress. k. khajuria   says that the brain releases some chemical components when we laugh. these chemical components are called neurotrophic factors and they are very important. they support the neurons in the brain and encourage the growth of new neurons. as a conclusion, you should laugh a lot before giving your exam. laughing will you with your exam and with your brain.

if you are having difficult times with friends or family members, laughing will also you face these problems. alannagh kelly is an assistant psychologist. she thinks that laughter can   make anger and anxiety vanish in the air. laughter can set a new and exciting atmosphere among people and it can make the bonds bewteen people stronger. so, if you are having a difficult time with someone you love, invite him / her to watch a comedy. you will probably make peace.

laugher will certainly protect you against stress and emotional pain. watching a comedy   may be a solution to stress or damaged bonds. " this remedy is fun , free, and best of all, no instructions needed."   alannagh kelly has said in her blog.