从跗围变化看,只有()楦类比同型号素头楦要小,因为这类鞋在脚背部位没有封闭式结构。
A.男舌式
B.男系带式
C.男三接头
D.男满帮托鞋
参考答案:A
人体正常的体细胞中染色体数目为23对(46条),则生殖细胞中染色体数目为: [ ]
A.23条
B.23对
C.46条
D.46对
By reading the article, we know how ______ in our daily life.
A.will we protect the earth
B.we can reduce pollution
C.should we save water
D.we must recycle things