1. All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.

    A) as a result of B) considering C) on purpose D) whatever

    2. The most pressing problem any economic system faces is how to use its scarce resources.

    A) puzzling B) difficult C)terrifying D) urgent

    3. The Klondike was the scene of one of the biggest gold rushes the world has ever known.

    A）location B)view C) event D) landscape

    4. Of the reptile groups, the snake group was the final one to appear.

    A) last B)best C) ugliest D)longest

    5. Colleges and universities usually give diplomas or certificates to students who complete course requirements satisfactorily.

    A) responsibly B) acceptably C) patiently D)respectfully

    6. A will is a document written to ensure that the wishes of the deceased are realized.

    A) fulfilled B) affiliated C) advocated D) received

    7. She has been the subject of massive media coverage.

    A) extensive B) negative C) responsive D) explosive

    8. The conference explored the possibility of closer trade links.

    A) rejected B) investigated C) proposed D) postponed

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