Katherine Protsenko
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Re:Сложные задания - 01.11.2007 16:59
Друзья!
Предлагаю на рассмотрение вопрос, который вызывает много дискуссий!
Parasitism is a relationship in which one organism, known as the parasite, lives in or on another organism, known as the host, from which it derives nourishment. Generally, the parasite is much smaller than the host. Although the host is harmed by the interaction, it is generally not killed immediately by the parasite, and some host individuals may live a long time and be relatively little affected by their parasites. Some parasites are much more destructive than others, however. Newly established parasite/host relationships are likely to be more destructive than those that have a long evolutionary history. With a longstanding interaction between the parasite and the host, the two species generally evolve in such a way that they can accommodate one another. It is not in the parasite's best interest to kill its host. If it does, it must find another. Likewise, the host evolves defenses against the parasite, often reducing the harm done by the parasite to a level the host can tolerate.
Which of the sentences below best expresses the information in the highlighted statement in the passage? The other choices change the meaning or leave out important information.
A A parasite is less likely to destroy the host when it attaches itself at first.
B Parasites that have lived on a host for a long time have probably done a lot of damage.
C The most destructive phase for a host is when the parasite first invades it.
D The relationship between a parasite and a host will evolve over time.
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