⑴____ A. shirt B. skirt C. ship
⑵____ A. chicken B. cheap C. lunch
⑶____ A. three B. math C. this
⑷____ A. these B. feather C. that
在△ABC中,∠C是直角,cosB=23,则sinB=( )
下列有关我国季风的叙述,正确的是( )
(2015•咸宁)下列成语中,属于描述光的折射现象的是( )