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【简答题】
历史资料研究的缺点是只能被动地囿于现有资料，不能主动地去提出问题并解决问题。而调查研究是收集第一手资料用以描述一个难以直接观察的群体的最佳方法。（ ）
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举一反三
【多选题】关于土壤热容量,描述正确的是()
A.
当土壤获得相同的热量时：热容量大的土壤升温慢
B.
当土壤失去相同的热量时：热容量大的土壤降温慢
C.
当土壤获得相同的热量时：热容量小的土壤升温快
D.
当土壤失去相同的热量时：热容量小的土壤降温快
【简答题】The friendship conveyed in the gift seems to be the most (value) __________ thing.
【简答题】One thing that leads us ________ here is that the selector seems to be in a position of power.
【单选题】土壤的组成描述正确的是( )
A.
土壤是由矿物质、动植物残体腐解产生的有机物质、土壤生物、水分和空气等组成。
B.
土壤是由固、液、气三相组成
C.
A和B都对
D.
A和B都不对
【单选题】One thing seems certain, which is that history and biology ____ tears.
A.
go hand in hand with
B.
side with
C.
put emphasis on
D.
put emphasis on
【多选题】关于土壤空气描述正确的是
A.
大气中CO2为0.03%，而土壤中是大气的十倍到数百倍
B.
大气中O2约占20%，而土壤空气只有10-20%
C.
土壤空气湿度接近100%
D.
土壤空气与大气有近似之处。
【单选题】According to the first paragraph, the author seems to think that
A.
it is a wonderful thing to live with both sexes
B.
studying with only one's own sex is helpful for academic achievements
C.
only gays will feel happy about being surrounded by the same sex
D.
parents try to protect their children by sending them to same sex schools
【单选题】What seems to be the most important thing you have to decide on before a meeting starts? ______
A.
The length of the agenda
B.
The frequency of the meetings
C.
A specific objective to accomplish
D.
Operational issues
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