Which of the following, if true, would most seriously call into question any conclusions
A. The total precipitation in the six experimental areas is significantly less than the total precipitation in the remaining areas of the forest.
B. The average precipitation per hectare is less in the six experimental areas than in the remaining areas of the forest.
C. The forest’s streams and rivers run mainly through the six experimental areas.
D. In the experimental areas, soil nutrients are found in proportions that differ from their proportions in other areas of the forest.
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关于抵押的说法，错误的是()。
A. 所有的抵押都必须办理抵押登记才能产生法律效力
B. 当事人应当采取书面形式订立抵押合同
C. 在同一抵押物上先成立的抵押权优先于成立的抵押权
D. 抵押财产必须是可以转让的
根据《中华人民共和国物权法》，下列财产中，可作为抵押权标的是()。
A. 土地使用权
B. 公立医院的医疗卫生设施
C. 依法被查封的财产
D. 正在建造的建筑物
The data collected from Experiments 1 and 2 show:
A. no clear trend in sulfate concentration among terrestrial deposits, but increasing sulfate concentrations in the lakes.
B. increasing sulfate concentration among terrestrial deposits, but decreasing sulfate concentrations in the lakes.
C. no clear trend in sulfate-concentration levels either among terrestrial deposits or among the lakes.
D. increasing sulfate concentrations among terrestrial deposits, but no clear trend in sulfate-concentration levels in the lakes.
应当先履行债务的当事人，有确切证据证明对方经营状况严重恶化，可以()。
A. 变更合同
B. 解除合同
C. 中止履行
D. 终止合同
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