According to Figure 3, 1 yr after emergence, the greatest percent of the seedlings were fr
A.red maple;red maple
B.red maple;white ash
C.white ash;red maple
D.white ash;white ash
A.red maple;red maple
B.red maple;white ash
C.white ash;red maple
D.white ash;white ash
第1题
ed at which the plane is going. Which
of the following would be a logical adjustment of the wing for such jets?
A.At speeds above 500 mph, the top of the wing would become flatter.
B.At speeds above 500 mph, the top of the wing would become more curved.
C.At speeds above 500 mph, the bottom of the wing would become curved.
D.None of the above
第2题
Which of the following test pairs reflects consistent experimental data?
A.Experiment 1, wing design 2;Experiment 2, airspeed 200
B.Experiment 1, wing design 1;Experiment 2, wing design 2
C.Experiment 1, wing design 3;Experiment 3, airspeed 400
D.Experiment 1, wing design 1;Experiment 3, airspeed 400
第3题
Which of the following is loam most likely to contain?
A.Sand
B.Clay
C.Silt
D.It cannot be determined from the information given.
第4题
enetic disorder with either a dominant or a recessive inheritance pattern, which of the following statements is accurate?
A.If neither of Pamela’s parents ever had disease X, then Pamela does not and never will have disease X.
B.If neither Pamela nor the father of Pamela’s child has disease X, then that child will never have disease X.
C.If both of Pamela’s parents had at least one copy of the disease X gene,then Pamela also has at least one copy of the disease X gene.
D.If neither of Pamela’s parents ever had disease X, but Pamela has disease X,then disease X is not a dominantly inherited genetic disorder.
第5题
s, while Species B was not.Supporters of the competing parental interest theory hypothesized that the monogamous species was unlikely to have active imprinted genes (since the fathers would have the same genetic stake in all the offspring born). Which of the following experimental results would they expect?
A.When females from Species A were bred with males from Species B, the resulting offspring were extremely small.
B.When females from Species A were bred with males from Species B, the resulting offspring were extremely large.
C.When females from Species B were bred with males from Species A, the resulting offspring were extremely large.
D.The offspring of Species B mice were consistently smaller than the off-spring of Species A mice.
第6题
re areas compared in Table 2 on page 48 is most reasonable?
A.Nutrient losses in the deforested area will slowly decline while nutrient losses in the undisturbed area will increase.
B.Both the undisturbed and deforested areas will experience increasing losses of nutrients.
C.Nutrient losses in the deforested area will slowly increase while nutrient losses in the undisturbed area will slowly decrease.
D.Nutrient losses in the undisturbed area will remain stable over the longer term while nutrient losses in the deforested area will slowly decline.
第7题
clear-cutting a forest ecosystem during the first three years after deforestation?
A.Clear-cutting has the effect of increasing the amount of coarse particulate matter that exits the ecosystem.
B.Clear-cutting has the effect of increasing the loss of super-fine particulate matter that exits the ecosystem.
C.Clear-cutting has little effect on the amount of fine particulate matter that exits the ecosystem.
D.Clear-cutting has the effect of increasing the loss of organic matter but not inorganic matter.
第8题
The results of experiment 2 show that,from 1993 to 2000, pH levels:
A.remained stable in the non-glacial lakes but increased in the glacial lakes.
B.decreased in the glacial lakes but decreased in the non-glacial lakes.
C.increased in the non-glacial lakes but decreased in the glacial lakes.
D.increased in the non-glacial lakes while remaining relatively stable in the glacial lakes.
第9题
25 plots remainedconstant. Which of the following alternative explana-tions is also consistent with the results?
A.The AGTB at all 25 plots increased.
B.The AGTB at all 25 plots decreased.
C.The AGTB at some of the plots increased and the AGTB at some of the plots decreased.
D.The AGTB at plots bounded by forest increased and the AGTB at plots bounded by clearingsremained constant.
第10题
izes of insectivoresand hummingbirds in the fragments studied?
A.Fragmentation increased the population sizes of both insectivores and hummingbirds.
B.Fragmentation decreased the population sizes of both insectivores and hummingbirds.
C.Fragmentation increased the population size of insectivores and decreased the population size ofhummingbirds.
D.Fragmentation decreased the population size of insectivores and increased the population size ofhummingbirds.
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