— How old is Steve?— He is ____________ and he has an ___________ sister.
A:13-year-old; 10 years old
B:13 years old; 11-year-old
C:13 years old; 10-years-old
D:13-years-old; 11-years-old
淀粉通过下列转化可以得到多种有机物
①小倩遇到问题独立思考之后才问同学 ②小明把课外活动时间都用来学习
③小刚上课时认真做好课堂笔记,课后及时复习 ④小芳制订了切实可行的计划,并按计划认真学习
⑤照搬别人的学习方法