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    What is a hurricane?

    You may already know that hurricanes are storms that can cause devastating (毁灭性的) waves, wind, and rain. They happen during “Hurricane Season,” which is from June 1st until November 30th in the Atlantic Ocean and from May 15th until November 30th in the Pacific Ocean.

    Types of Hurricanes

    There are five types of hurricanes, which are based on wind speeds. The categories help people know how much damage a hurricane may cause because the greater the wind speed, the more dangerous the storm. For example, a Category 5 hurricane has winds over 155 miles per hour, which are strong enough to destroy the buildings along the shorelines completely.

    Hurricane Dangers

    When a hurricane happens together with heavy rainfall, there can be a devastating flood. The centre of a hurricane is called the eye. While most of a hurricane has dangerously strong winds, the eye is actually a calm area in the storm. When the eye of a hurricane passes over land, people might think that it's over, but before long the wind and rain increase again as the second part of the hurricane moves through.

    Hurricane Safety Tips

    There is no way to stop a hurricane or make it change direction, so if you ever find yourself in the path of a hurricane, be sure to remember the following safety tips.

    Be sure you have a radio, batteries, fresh drinking water, and enough food.

    Tell neighbours, friends, and family members your emergency plans. Tell them where you'll go if you need to leave your home.

    If you live near the ocean, leave your home and travel to a safe place. You could stay with a friend or a family member, in a hotel／motel, or in an emergency shelter area.

    Stay inside during the storm. You could be seriously injured if you go outside.

B

    It is important for each child to get enough sleep every day．Here．we'll learn more about that．{#blank#}1{#/blank#}

    It usually depends on their age．Newborns (新生儿)of 0 to 3 months should sleep for about 18 hours a day．Babies of 4 to 11 months should start to sleep through the night，for 9 to 12 hours at a time．{#blank#}2{#/blank#}Children of 3 to 5 years should get 11 to 13 hours a day．Children of 6 to 13 need 9 to 11 hours of sleep．Teenagers of 14 and up need 8 to 10 hours of sleep．{#blank#}3{#/blank#}

    Set a strict nap timetable(小睡时间表)．Younger children should take a short sleep during the day．Even older children can benefit(得益于)from late—afternoon naps if they don't get enough steep at night．{#blank#}4{#/blank#}

    Pay attention to(注意)screen time．Remember to ask children to tum off the television and the computer an hour before they go to bed．If possible，get them out of their bedrooms since the light(光)from the screens can make sleep a difficult job．

Get children movin9．{#blank#}5{#/blank#}Running around and playing sports are great, but children can move in other ways．too．They can take a dog for a walk or go to the park—just get them out of the house and get them moving．

    When it comes to the letter grade on your test or homework, you might notice that there is no letter E. Have you ever thought about why that is so?

    In the A, B, C, D and F grading system, the first four letters are typically considered passing grades. An F in this system simply stands for“fail”.The word“fail”happens to start with the letter F, which seems to leave out the letter E. The fact”．Some schools have U grade for“unsatisfactory”,or I grade for “incomplete”.

    Even with all this said, we should also point out that E grade actually has been used pretty commonly throughout the history of letter grades in the US.

    The first college in the US to use a letter grading system like the ones we use today is Mount Holyoke College. In 1897, they began to use the following grading scale:

A: 95-100%(excellent)       B: 85-94%(good)      C: 76-84%(fair)

D: 75%(barely passed)       E: below 75%(failed)

    We can see the inclusion of E instead of F.

    Gradually,the letter grading system became more popular throughout the US. However, many schools decided to drop the E grade and go straight to F.There is no evidence(证据) to really support this, but one possible explanation is that teachers were worried that some students and parents might mistake E for “excellent”.

    Why do we have letter grades? Well, part of the reason is that they made grading simpler during a time of great change for schools. As the 20th century began,growing cities and an increase in immigration led to larger school classrooms. Most teachers at that time thought this new letter grading system was an easy, fair and clear way to grade students.

    Today, more and more people argue that letter grades don't fully reflect(反映) student learning. However，as teachers try to improve grading methods, many parents continue to favor the letter grades they got as kids, they are familiar(熟悉) and easy for parents to understand. So while they might not be perfect, the letter grades probably aren't going away any time soon.

    One of the easiest ways to keep healthy is to do jogging. Jogging is the name for very gentle (平和的) running-it is just a little faster than walking.

    First jog slowly 20 meters, and then walk 20 meters. Little by little if you are not feeling very tired, you may jog more and walk less. Finally, jog the whole way. It will be easy for you to start jogging for 15 minutes twice a week. Then slowly increase this to 20 ~ 30 minutes every day. The longer you join in jogging, the more you will enjoy it and the healthier you will become. Some people like jogging alone and others enjoy doing it with friends. Jogging in groups makes people keener (更热心的) because you just can't stay in bed while there is a group of friends waiting outside.

If you want to start jogging, prepare a pair of comfortable shoes and a determined(坚定的) mind.