astronauts must exercise for ( ) every day in space so they are strong enough to walk when they return to Eartha.1 hourb.2 hours c.10 minutes d.30 minutes最好是把问题意思说出来.
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/01 14:30:08
xݑn0_@Yl}8نfP TbS>Eݘӥe&cw#o8/,0+eBÖ2'Xߴ@3ȗ!&yMISRtx"6F,{ޭrfbsXyWnVk85i/E(_,)s&tp