She doesn't know how to spend her summer holidays. Let's help her some good ideas.
A:come out
B:come up
C:catch up with
D:come up with
已知sin10°=k,则sin70°=( )
克隆是生命科学研究的热点,下列相关叙述错误的是( )
下图是“黄河流域简图”,图中表示黄土高原的数字代号是( )