A:筛选出用于亲子鉴定的STR应具有不易发生变异的特点
B:为保证亲子鉴定的准确率,应选择足够数量不同位点的STR进行检测
C:有丝分裂时,子细胞含有图中(GATA)8的概率是1/2
D:该女性的儿子X染色体含有图中(ATAG)13的概率是1/2
—I’m a ______ . I can hop .
Mrs. Chen teaches English. We like class very much.
美国的主体部分位于( )
王刚从家去学校,每分走60米,15分可以走到学校.如果每分走75米,几分可以走到学校?(用比例解)
Many students take the school bus to school every day. Parents think taking the school bus is usually safe (安全的), but sometimes it is dangerous. Some students don't keep the school bus rules. What are the school bus rules?
Arrive at the bus station early.
Wait for (等候) the school bus at the bus station.
Don't run at the bus station.
Don't walk or fight on the bus.
Don't get off (下车) the bus when it goes.