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对于新的物种形成的机制有不同的假说，但基因突变、自然选择是两个基本的过程。物种的多样性是由于地球自然环境的不断演化和区域分异形成的。()

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许多生态系统都具有美学价值，森林、草原、湿地、高山、高原、荒漠都各具独特的魅力，形成各自不同的风光，是有益的旅游资源。()

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For well over a century, one street in New York City
has been known for the heart of the American theater. The 【S1】
name of the street is Broadway. Mention that name to
anyone has ever visited New York, and he will remember 【S2】
bright lights, eager crowds, and electric air of excitement. 【S3】
Over the years, Broadway has known successful and 【S4】
failure, praise and scorn. In recent time it has faced
special problems, both in artistic and financial. Yet, 【S5】
in spite all its imperfections, Broadway remains the center 【S6】
of the theatrical activity in the United States. The goal of
young performers in the U.S. is still to act in a Broadway play.
On Broadway, a play must be popular to attract 【S7】
audiences over a long period of time. A long run is
essential because Broadway theaters are given financial 【S8】
support by the government, as are leading theaters in most
other countries. Instead, funds are raised to individual 【S9】
productions and must be repaid to the investors, if at all
possible. The producers need to find plays which will
please audiences. Often the result is a play with little
artistic price. 【S10】
【S1】