英语：-Need I finish my work today?-Yes,you __.A.do B.can C.mus

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英语：
-Need I finish my work today?-Yes,you __.
A.do B.can C.must D.may
同义句转换：
My father will go back home in two days.
My father will__home two days later.
科学：
光源S发出的一条光线,其反射光经过P点,在图乙中作出这条光线和反射光线（这道题目出示了界面,但没有入射点,界面上是S 和P 两点,应该怎样找出入射点,确定法线,然后作出这两条光线呢?）

英语：C；back
科学：做S（或P）关于界面得对称点,连接SP,与界面得交点就是入射点O.连接OP,OS,再标上光线的箭头,over.

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