俄罗斯的英文名称为()。
A、Singapore
B、Russia
C、VietNam
D、Philippines
参考答案:B
His pen didn't work well, so he_______a new one. [ ]
A. asked for
B. looked for
C. sold out
D. gave out
视野是指人眼能观察到的范围,其中在头部固定,而眼球静止不动的状态下自然可见的范围成为()。
A.静视野
B.动视野
C.注视野
D.视平面