The earth is one of the _______ pianets and it goes around the sun. A.sun B.suns C.suns' D.sun'sWith their help,man has known the ______(A.earth B.sun C.stars D.satellites) better than before and has done better _______(A.on B.in C.about D.with) many
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/09 20:46:27
xn@_en