意群训练:The isotopic composition of lead often varies from one source of common copper ore to another,with variations exceeding the measurement error;and preliminary studies indicatevirtually uniform is topic composition of the lead from a single copper-ore source.
66. More probable is bird transport,either externally,by accidental attachment of the seeds to feathers,or internally,by the swallowing of fruit and subsequent excretion of the seeds.
更有可能的是鸟类运输:或者是通过外部途径,即由于种籽偶然粘附在羽毛上;或者是通过内部方式,即由于鸟类吞食果子并随后将种籽排泄出来。
难句类型:复杂修饰、插入语、倒装
解释:句首有一个倒装,正常语序是bird transport is more probable。后面的句子中由于插入部分的频繁出现使句子显得十分凌乱。
意群训练:More probable is bird transport,either externally,by accidental attachment of the seeds to feathers,or internally,by the swallowing of fruit and subsequent excretion of the seeds.
67. A long-held view of the history of English colonies that became the United States has been that Englands policy toward these colonies before 1763 was dictated by commercial interests and that a change to a more imperial policy , dominated by expansionist militarist objectives , generated the tensions that ultimately led to the American Revolution .
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