The newspaper will have to close down if it cannot increase its ________ considerably.
A. distribution
B. contribution
C. prescription
D. circulation
Traditional linguists believe that the written form of language is ______to the spoken form.
A. senior
B. junior
C. inferior
D. superior
急淋与急非淋白血病分类主要根据（）
A. 白血病细胞的数量
B. 白血病细胞的类型
C. 白血病细胞的分化程度
D. 白血细胞浸润的部位
E. 白血病裂孔现象
They ________ extensive and possibly dangerous actual flight training.
A. undertake
B. undergo
C. underplay
D. underuse
微信支付 
支付宝支付