【C16】A．lockingB．mockingC．blockingD．flocking

【C18】A．fleets ofB．swarms ofC．flocks ofD．clusters of

In the phrases a herd of cattle, a flock of sheep, both cattle and sheep contain two

"Birds of a feather flock together." In some self-help books about making friends, it is a

The explosion scattered a flock of birds r

词汇选项The explosion【 scattered】 a flock of birds ro

Nowadays many rural people flock to the city to l