【C19】A．flockB．gangC．crowdD．pile

A secretary must（)big pile of files and correspondence in office.A. deal withB. agree w

【C9】A．umberB．teamC．crowdD．staff

听力原文：（A) Some building materials are piled up on the ground.（B) A brick wall is being

We met a large ______ of whales on our voyage to Australia.A．flockB．schoolC．herdD．swarm

A．classB．groupC．crowdD．gang

A．numberB．amountC．pileD．piece