告别了放纵与自由,新学期将我们领进英语的殿堂.一切将要展开新的一页,让我们一起来阅读小学生阅读集训:Tornadoes are coming吧~~
Keep your eyes on the sky it looks like 2006 will be a big year for tornadoes. As of the first week in April, there have already been 445 twisters in the United States. Last year, there were only 96 tornadoes by the beginning of April. According to the National Oceanic and Atmospheric Administration (NOAA), a government agency that studies the environment, this marks the most intense tornado activity in the first three months of any year since 1999. Previous years with a busy start have produced high numbers of tornadoes throughout the year.
For those living in Tornado Alley from west Texas all the way up to North Dakota, springtime is tornado time. What exactly causes a twister? Tornadoes form when moist, warm air is caught under dry, cool air. When the warm air rises, it upsets the cool air, spinning (使快速旋转) the air into a funnel-like shape. The spinning air is officially categorized as a tornado once it touches the ground. These twisters can reach extremely high speeds, sometimes more than 250 miles per hour!
Scientists try to measure the speed and damage of tornadoes using what is called the Fujita Scale, or F scale. The scale ranges from F0, with winds under 73 mph, to F5, with winds between 261 and 318 mph. Violent tornadoes in the F4 and F5 categories sometimes last more than an hour, and cause incredible amounts of damage, often destroying everything for hundreds of miles. Fortunately, these account for less than 1 percent of all tornadoes.
If the first three months of this year are any indication, there are more tornadoes to come. Remember, the best way to stay safe during a tornado is to find shelter in the basement of a strong building, avoiding windows. Experts warn against trying to escape a tornado in a car.
Help: tornado n. 旋风, 龙卷风, 大雷雨, 具有巨大破坏性的人(或事物)
moist adj. 潮湿的
categorize [ktig[raiz] vt. 加以类别,分类
2016年中考英语词组辨析:at/ beside/ by/ near
2016年中考英语词组辨析:aim/ purpose/ object
2016年中考英语词组辨析:arise/ rise
2016年中考英语词组辨析:at/ in
2016年中考英语词组辨析:accurate/exact/correct
2016年中考英语词组辨析:at last/ finally/ in the end
2016年中考英语词组辨析:as soon as/ as early as/ as quickly as
2016年中考英语词组辨析:be amazed at (by) / be amazed to do sth
2016年中考英语词组辨析:arrive/ reach/ get to
2016年中考英语词组辨析:ask / inquire/ question
2016年中考英语词组辨析:beat/ hit/ strike/ knock
2016年中考英语词组辨析:at the top of/ on the top of
2016年中考英语词组辨析:another/ other/ more
2016年中考英语词组辨析:arms/ weapon
2016年中考英语词组辨析:almost/ nearly
2016年中考英语词组辨析:already/ yet /still
2016年中考英语词组辨析:at school/ in school/ in a (the) school
2016年中考英语词组辨析:as well as/ as well
2016年中考英语词组辨析:always / yet
2016年中考英语词组辨析:awake/ wake/ waken
2016年中考英语词组辨析:at/ to
2016年中考英语词组辨析:at Christmas/ on Christmas
2016年中考英语词组辨析:become/ get/ go/ grow/ turn
2016年中考英语词组辨析:as/ because/ for/ since
2016年中考英语词组辨析:alone/ lonely
2016年中考英语词组辨析:around/ round
2016年中考英语词组辨析:all/ whole
2016年中考英语词组辨析:always/often/frequently/usually/sometimes
2016年中考英语词组辨析:allow/ permit/ let/ promise
2016年中考英语词组辨析:asleep/ sleep / sleepy