-which is more useful,biology or chemistry -i think ___them is useful.-which is more useful,biology or chemistry -i think ___them is useful.a.either of b .none of c,both of d.all of 选哪个 ,回答,急

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-whichismoreuseful,biologyorchemistry-ithink___themisuseful.-whichismoreuseful,biologyorchemistry-it

-which is more useful,biology or chemistry -i think ___them is useful.-which is more useful,biology or chemistry -i think ___them is useful.a.either of b .none of c,both of d.all of 选哪个 ,回答,急
-which is more useful,biology or chemistry -i think ___them is useful.
-which is more useful,biology or chemistry
-i think ___them is useful.
a.either of b .none of c,both of d.all of 选哪个 ,回答,急

-which is more useful,biology or chemistry -i think ___them is useful.-which is more useful,biology or chemistry -i think ___them is useful.a.either of b .none of c,both of d.all of 选哪个 ,回答,急
a.either of -which is more useful,biology or chemistry -i think ___them is useful.
生物和化学哪一个更有用?我觉得每一个都有用.首先是因为前边问题中只涉及两项生物和化学,所以排除b 和d 都表示三者或三者以上.其次因为答句谓语用的是is三人称单数,所以可知主语是为单数.both of 作主语谓语用复数,所以只有选a .either of 表示每一个都