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广东省揭阳市梅州2010届高三第二次联考英语卷
阅读下面短文，掌握其大意，然后从21-30各题所给的四个选项中选出最佳选项。
What kinds of animals lived on the earth millions of years ago? Scientists need a ___21 to learn about those animals that lived in the past. For this reason, they study fossil 22 that are preserved in the earth’s crust (地壳).
阅读下面短文，掌握其大意，然后从21-30各题所给的四个选项中选出最佳选项。
What kinds of animals lived on the earth millions of years ago? Scientists need a ___21 to learn about those animals that lived in the past. For this reason, they study fossil 22 that are preserved in the earth’s crust (地壳).
