髓母细胞瘤( )
A．基底节B．大脑皮层C．脑桥D．大脑半球两侧中线附近E．小脑中线附近 下列脑部疾病最好发的部位是
参考答案：E
It is believed to _____ over by sandstorms from AD 200 to AD 400.
A．gradually cover
B．be gradually being covered
C．have been gradually covered
D．be gradually covered
债务人仍保持对担保财产的占有权，而债权人则取得所有权或部分所有权，或者当债务人未按期偿还债务时获得对该财产所有权的权利，这是( )的一个重要特征。
A．抵押
B．质押
C．保证
D．留置
