设关系R与关系S具有相同的目，且相对应的属性的值取自同一个域，则R∪S可记作( )。

A．{t|t∈R∨t∈S}

B．{t|t∈R∧t┐∈S}

C．{t|t∈R∧t∈S}

D．{t|t∈R∨t┐∈s}

All the children are busy going over their lessons as the final exam is __________.

A．along the way

B．in the way

C．on the way

D．by the way