问题补充:
单选题Itstillpuzzlestoday’sscientists______somemammalsproducetheiryoung______otherslayeggstoproducetheiroffspring(后代A.that; whileB.why; whileC.how; whenD.what; as
答案:
B
时间:2018-10-26 14:28:24
单选题Itstillpuzzlestoday’sscientists______somemammalsproducetheiryoung______otherslayeggstoproducetheiroffspring(后代A.that; whileB.why; whileC.how; whenD.what; as
B