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1.In order to understand the nature of the ecologist's investigation，we may think of the density-dependent effects on growth parameters as the"signal"ecologists are trying to isolate and interpret，one that tends to make the population increase from relatively low values or decrease from relatively high ones，while the density-independent effects act to produce"noise"in the population dynamics.
2.Inheritors of some of the viewpoints of early twentieth-century Progressive historians such as Beard and Becker，these recent historians have put forward arguments that deserve evaluation.
3.Despite these vague categories，one should not claim unequivocally that hostility between recognizable classes cannot be legitimately observed.
4.It can be inferred from the passage that the author would be most likely to agree with which of the following statements regarding socioeconomic class and support for the rebel and Loyalist causes during the American Revolutionary War
5.She wished to discard the traditional methods and established vocabularies of such dance forms as ballet and to explore the internal sources of human expressiveness.
6.There have been attempts to explain these taboos in terms of inappropriate social relationships either between those who are involved and those who are not simultaneously involved in the satisfaction of a bodily need，or between those already satiated and those who appear to be shamelessly gorging.
7.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 indicate virtually uniform is topic composition of the lead from a single copper resource.
8.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.
9.A long-held view of the history of English colonies that became the United States has been that England's 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.
10.They are called virtual particles in order to distinguish them from real particles，whose lifetimes are not constrained in the same way，and which can be detected.
它们被称为"虚粒子"(virtual particle)，以便与实粒子(real particle)区分开来，而实粒子则不会以这种方式受到制约，并且其存在可得以测定。