A:How
B:What
C:When
D:Where
撒哈拉以南非洲的一些国家为改变“单一商品经济”的局面,采取的措施中不合理的是( )
下列说法正确的是( )
1+3+5+7+9+11+13+11+9+7+5+3+1=( )
These robots will be designed to look like people to make them more________and easier to sell to the public.