Sintesis de Periodo Grado Segundo

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    1. LEARN AND PRACTICE:

    2. QUESTION AND NEGATIVE SENTENCES PRESENT SIMPLE:

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    MOTHS OF THE YEAR

    Month Short Form Days Season

    1 January Jan. 31 Winter

    2 February Feb. 28/29

    3 March Mar. 31 Spring

    4 April Apr. 30

    5 May May 31

    6 June Jun. 30 Summer

    7 July Jul. 31

    8 August Aug. 31

    9 September Sep. 30 Autumn

    10 October Oct. 31

    11 November Nov. 30

    12 December Dec. 31 Winter

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    Two solid digestive organs, the liver and the pancreas, produce digestive juices

    that reach the intestine through small tubes called ducts. The gallbladder stores the

    liver's digestive juices until they are needed in the intestine. Parts of the nervous

    and circulatory systems also play major roles in the digestive system.

    The digestive system.

    Why is digestion important?When you eat foodssuch as bread, meat, and vegetablesthey are not in a form

    that the body can use as nourishment. Food and drink must be changed into

    smaller molecules of nutrients before they can be absorbed into the blood and

    carried to cells throughout the body. Digestion is the process by which food and

    drink are broken down into their smallest parts so the body can use them to build

    and nourish cells and to provide energy.

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    How is food digested?

    Digestion involves mixing food with digestive juices, moving it through the digestive

    tract, and breaking down large molecules of food into smaller molecules. Digestion

    begins in the mouth, when you chew and swallow, and is completed in the small

    intestine.

    Respiratory SystemThe cells of the human body require a constant stream of oxygen to stay alive. Therespiratory system provides oxygen to the bodys cells while removing carbondioxide, a waste product that can be lethal if allowed to accumulate. There are 3major parts of the respiratory system: the airway, the lungs, and the muscles ofrespiration. The airway, which includes the nose, mouth, pharynx, larynx, trachea,bronchi, and bronchioles, carries air between the lungs and the bodys exterior.The lungs act as the functional units of the respiratory system by passing oxygeninto the body and carbon dioxide out of the body. Finally, the muscles ofrespiration, including the diaphragm and intercostal muscles, work together to actas a pump, pushing air into and out of the lungs during breathing.

    Circulatory system:

    The cardiovascular system consists of the heart, blood vessels, and the

    approximately 5 liters of blood that the blood vessels transport. Responsible for

    transporting oxygen, nutrients, hormones, and cellular waste products throughout

    the body, the cardiovascular system is powered by the bodys hardest-working

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    organ the heart, which is only about the size of a closed fist. Even at rest, the

    average heart easily pumps over 5 liters of blood throughout the body every

    minute....

    The muscular system is an organ systemconsisting

    ofskeletal, smooth and cardiacmuscles. It permits movement of the body,

    maintains posture, and circulates blood throughout the body. The muscular system

    in vertebrates is controlled through thenervous system, although some muscles

    (such as the cardiac muscle) can be completely autonomous.

    There are three distinct types of muscles: skeletal muscles, cardiac or heartmuscles, and smooth (non-striated) muscles. Muscles provide strength, balance,

    posture, movement and heat for the body to keep warm.

    http://en.wikipedia.org/wiki/Organ_(anatomy)http://en.wikipedia.org/wiki/Skeletal_musclehttp://en.wikipedia.org/wiki/Smooth_musclehttp://en.wikipedia.org/wiki/Cardiac_musclehttp://en.wikipedia.org/wiki/Musclehttp://en.wikipedia.org/wiki/Musclehttp://en.wikipedia.org/wiki/Vertebratehttp://en.wikipedia.org/wiki/Nervous_systemhttp://en.wikipedia.org/wiki/Cardiac_musclehttp://en.wikipedia.org/wiki/Organ_(anatomy)http://en.wikipedia.org/wiki/Skeletal_musclehttp://en.wikipedia.org/wiki/Smooth_musclehttp://en.wikipedia.org/wiki/Cardiac_musclehttp://en.wikipedia.org/wiki/Musclehttp://en.wikipedia.org/wiki/Vertebratehttp://en.wikipedia.org/wiki/Nervous_systemhttp://en.wikipedia.org/wiki/Cardiac_muscle
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    United States of America

    CAPITAL : Washington, D.C. (District of Columbia)

    FLAG : The flag consists of 13 alternate stripes, 7 red and 6 white; these represent

    the 13 original colonies. Fifty five-pointed white stars, representing the present

    number of states in the Union, are placed in nine horizontal rows alternately of six

    and five against a blue field in the upper left corner of the flag.

    ANTHEM : The Star-Spangled Banner.

    The United States shares international land borders with two nations:The Canada United States border to the north

    The Mexico United States border to the south

    AMERICAN PRESIDENT

    SYMBOLS:

    The President of the United States of America is the headof state and head of government of the United States. Thepresident leads the executive branch of the federalgovernment and is the commander-in-chief of the UnitedStates Armed Forces.The president is indirectly elected by the people through theElectoral College to a four-year term, and is one of only two

    nationally elected federal officers, the other being the VicePresident of the United States. The Twenty-second

    Amendment, adopted in 1951, prohibits anyone from everbeing elected to the presidency for a third full term. It alsoprohibits a person from being elected to the presidencymore than once if that person previously had served aspresident, or acting president, for more than two years ofanother person's term as president. In all, 43 individualshave served 55 four-year terms. On January 20, 2009,Barack Obama became the 44th and current president.

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    Addition is the mathematical operation of combining or adding two numbers toobtain an equal simple amount or total. Addition also provides a model for relatedprocesses such as joining two collections of objects into one collection. Repeatedaddition of the numberone is the most basic form ofcounting.

    SUBTRACTION It is one of the four basic arithmetic operations; it is the inverse ofaddition, meaning that if we start with any number and add any number and thensubtract the same number we added, we return to the number we started with..Subtraction is denoted by a minus signin infix notation. The traditional names forthe parts of the formula:

    http://www.answers.com/topic/operation-mathematicshttp://www.answers.com/topic/1-1http://www.answers.com/topic/counting-1http://en.wikipedia.org/wiki/Arithmetichttp://en.wikipedia.org/wiki/Additionhttp://en.wikipedia.org/wiki/Plus_and_minus_signshttp://en.wikipedia.org/wiki/Plus_and_minus_signshttp://en.wikipedia.org/wiki/Infix_notationhttp://en.wikipedia.org/wiki/Formulahttp://www.answers.com/topic/operation-mathematicshttp://www.answers.com/topic/1-1http://www.answers.com/topic/counting-1http://en.wikipedia.org/wiki/Arithmetichttp://en.wikipedia.org/wiki/Additionhttp://en.wikipedia.org/wiki/Plus_and_minus_signshttp://en.wikipedia.org/wiki/Infix_notationhttp://en.wikipedia.org/wiki/Formula
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