Itisdifficulttounderstandthiskindof_______calculation.
A、intricateA
参考译文：很难理解这种错综复杂的计算。 intricate 错综复杂的，纠缠不清的; varied 不同的，种种的; indispensable不可缺少的，绝对必要的; equable 变动甚少的，稳定的。
Asactivitycarried________asonethinksfitinone’ssparetime,leisurehasseveralfunctions.
翻译：Wewouldliketoinformyouthatatpresentwecansupplyyouwithvariouskindsofmen'sleathershoes.
翻译：Wesendyouabrochureonthevariouskindsofbicyclenowavailableforexport
Thenewlawsthreatentodeprivemanypeople_______themostelementaryfreedoms.
They________extensiveandpossiblydangerousactualflighttraining.
