First of all, the teachers must be strict their students. [ ]
A.at
B.in
C.for
D.with
答案:D
当x=-2时,代数式-x2+2x-1的值是______.
读中国疆域简图,回答下列问题.
(1)我国的海域:B______,C______,D______.
(2)我国最大的岛屿是:F______.
(3)我国东部濒临的大洋为:E______.
(4)我国邻国:H______,G______,M______.