分析公司的资产负债表，可以得出（）。
A.公司的财务状况如何
B.是否具有持续发展能力
C.资本结构是否合理
D.流动资金是否充足
参考答案：A, C, D
Loulan is believed ____ by sandstorms from AD 200 to AD 400.
A．to be gradually covered over
B．to have been gradually covered over
C．being gradually covered over
D．having been gradually covered over
