下图表示一个细胞有丝分裂过程中染色体变化的不同情况,在整个细胞周期中,染色体变化的顺序是
A.①④⑤③②
B.②③①④⑤
C.①⑤④③②
D.⑤④③②①
答案:C
Why have the Americans developed space shuttle according to the passage
Which of the following statements is NOT true of the passage
A.It discusses fertility clinics.B.It defines stem cells.C.It mentions artificial fertilization.D.It identifies the origins of stem cells.
某市拥有500万人口,其中从业人数450万,登记失业人数15万,该市统计部门公布的失业率应为( )。
A.3%
B.3.2%
C.3.5%
D.3.8%