Ancient chinese civilization originated in the valleys of the
a. yangtze and mekong rivers.
b. lo min and hainan rivers.
c. yellow and yangtze rivers.
d. indus and lumai rivers.
e. nanjing and hunan rivers.

China has one of the oldest and most interesting civilization through the years. Its origin was situated between the Yellow and the Yangtze river, the denser population being along the Yellow river. China's first civilization was the Shang Dynasty (1600 BC) during the Neolithic era.

The correct answer is letter B

It is called Ragtime a musical rhythm cultivated in the United States, especially between 1896 and 1917, is called ragtime, and it is recognized as one of the matrixes that formed North American jazz. Its origin is related to bars and juke-joints frequented by North American blacks, and its name derives from the expression "ragged time".

Strictly speaking, there are four main types of ragtime music, but the most well-known and still heard type today is the instrumental "classic" rag, which consists of a piece for piano or band, of syncopated rhythm, with a characteristic bass " boom-chick ". A typical example is the soundtrack to the movie "Stroke by Master" (The Sting), with Paul Newman and Robert Redford. In addition to this more well-known type, there are the "ragtime songs" or vocal rag, which eventually merged with popular music and the Vaudeville theater, the "ragtime waltzes" or "syncopated waltzes" (ragtime waltzes or syncopated waltzes), played in a 3/4 time, famous in the golden age of ragtime, and the last type, the "jazz rag", which consists of adapting any popular song and "breaking" or "tearing up" your time so as to leave it with a more danceable rhythm. Examples of this type of rag are found in "Mack the Knife" (originally the opening song for "Opera of the Three Vintems", a piece by the German Bertolt Brecht) and "Dinah", performed by several artists, including Louis Armstrong and Duke Ellington.