解析 A。flock是集合名词,a flock of birds表示一群鸟这个整体概念,作主语时谓语动词用单数形式。这里描述一种自然现象,用一般现在时,所以用is。选项B are用于复数主语;选项C was是一般过去时的单数形式,这里不需要过去时态;选项D were是一般过去时的复数形式,不符合要求。
A. is B. are C. was D. were 相关知识点: 试题来源: 解析 B。“flock of birds”表示一群鸟,强调鸟这个群体里的各个个体,谓语动词用复数形式。A 选项 is 单数形式错误;C 选项 was 过去式单数形式不对;D 选项 were 过去式复数形式,此句不是过去时态。反馈 收藏 ...
May be enough for you You see that I am flying south For the winter once again I feel like I am bailing out On my only friend Aside from all the things we do To make each other blue Can you forgive me again? I am the one to blame You've been there all the time I'm a miss...
Life After Work: Flying South For The WinterThis article discusses "snowbird" jobs that change locations as the seasons change. The health-care industry has pioneered this type of employment, and sends its many of workers to Sun Belt states in the winter months and north in the summer. This...
Next autumn when you see wild geese (大雁) heading south for the winter flying in a V formation you might think about what scientists have discovered as to why they fly that way. As each bird flaps (拍打) its wings, it creates an uplift (上升力) for the bird immediately following. By...
A. is B. are C. was D. were 相关知识点: 试题来源: 解析 B。“The flock of birds”表示一群鸟,是复数概念,且句子是现在进行时,所以用 are。A 选项 is 用于单数主语;C 选项 was 和 D 选项 were 都是过去时,与句子时态不符。反馈 收藏 ...
The flock of birds _ flying south for the winter. A. is B. are C. be D. was 相关知识点: 试题来源: 解析 A。“flock”作为一个整体概念,谓语动词用单数。B 选项“are”不符合整体概念;C 选项“be”形式错误;D 选项“was”时态不符本题语境。反馈 收藏 ...
Next autumn when you see wild geese heading south for the winter flying in a V formation, you might think about what scientists have discovered as to why they fly that way.As each bird flaps its wings, it creates uplift for the bird immediately following
One day, Wally, one of the wild ducks in the formation, spotted something on the ground. It was a barnyard with a flock of ducks who lived on the farm. They were waddling around on the ground, quacking merrily and eating that was thrown on the ground for them every ...
9.Next autumn when you see wild geese heading south for the winter flying in a V formation.you might think about what scientists have discovered as to why they fly that way.As each bird flaps its wings.it creates uplift for the bird immediately followi