【单选题】
The beautiful ( ) varies with the season.
【单选题】
You should concentrate ( ) your study.
【单选题】
Students seek ( ) books and participate of their own volition.
【单选题】
we should take an active involvement ( ) sports.
【单选题】
Memory and reading are in ( ) interaction with one another.
【单选题】
He is the eldest son and ( ) heir to the title.
【单选题】
Further developments subsequent ( ) our meeting may improve the employment rate.
【单选题】
Nothing is ( ) than good health.
【单选题】
She experimented ( ) a new breed of white rats.
【简答题】
将句子翻译成英文:这是低品质的东西。(stuff)