1787年宪法规定美利坚合众国实行的 * * 组织形式是 ( )
A.议会共和制
B.总统共和制
C.君主立宪制
D.责任内阁制
答案:B
植物细胞的分裂过程顺序正确的是( )
①细胞质平分为二,各含一个细胞核
②在细胞核中央形成新的细胞壁和细胞膜
③细胞核平分为二.
A.①②③
B.②①③
C.③②①
D.①③②
Young children seem to master computer games __________. And playing computer games will always make them feel ___________.
A.easily, easily
B.with ease, at ease
C.easy, easy
D.at ease, with ease