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.
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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
中国银监会选择以（）作为我国混合资本工具的主要形式。
A. 储蓄国债
B. 可转换债券
C. 场外交易的企业债券
D. 银行间市场发行的债券
Based on the information in Scientist 1&39;s view, which of the following materials must be present on Europa if a magnetic field is to be generated on Europa？
A. Frozen nitrogen
B. Water ice
C. Dissolved salts
D. Molten magma
According to the information provided, which of the following descriptions of Europa would be accepted by both scientists？
A. Europa has a larger diameter than does Jupiter.
B. Europa has a surface made of rocky material.
C. Europa has a surface temperature of 20°C.
D. Europa is completely covered by a layer of ice.
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