第 1 题 · 六级
The mountain is a formidable challenge for climbers, which the experienced guide warned them about.
核心词：formidable ˈfɔːmɪdəbl adj. 可怕的，令人敬畏的；艰巨的
这座山对登山者来说是个艰巨的挑战，经验丰富的向导警告过他们。
一般现在时主系表 + 介词短语 + which 从句 + warn sb about短语 a formidable challenge短语 a formidable opponent
The mountain is a ___ challenge for climbers, which the experienced guide warned them about.
第 2 题 · 六级
The victory was decisive for the whole team, which the players celebrated with tears of joy.
核心词：decisive dɪˈsaɪsɪv adj. 决定性的，果断的
这场胜利对整个团队具有决定性意义，队员们喜极而泣地庆祝。
一般过去时主系表 + 介词短语 + which 从句 + 介词短语短语 a decisive factor短语 a decisive victory
The victory was ___ for the whole team, which the players celebrated with tears of joy.
第 3 题 · 六级
The army used heavy artillery to defend the town, which the enemy could not break through for weeks.
核心词：artillery ɑːˈtɪləri n. 火炮，大炮
军队使用重型火炮保卫城镇，敌人数周无法攻破。
一般过去时主谓宾 + 目的不定式 + which 从句（情态否定 + break through）短语 heavy artillery短语 field artillery
The army used heavy ___ to defend the town, which the enemy could not break through for weeks.
