蒙古大军最远曾深入到欧洲大陆（）流域
A.多瑙河
B.莱茵河
C.伏尔加河
D.塞纳河
参考答案：A
—It's not just the government's duty to protect the _____.
—I agree. My grandpa often _____ up garbage for recycling and takes good care of animals and plants.
He is a good example to us. [ ]
A. environment; picked
B. environments; pick
C. environment; picks
D. environment; picking
以下哪一个模型是针对市场风险的计量模型（）
A．Credit Metrics
B．KMV模型
C．VAR模型
D．高级计量法
