新概念英语第53课Hot Snake.A bird had snatched up the snake from the ground.为什么要用过去完成
题目
新概念英语第53课Hot Snake.A bird had snatched up the snake from the ground.为什么要用过去完成
全文内容
At last firemen have put out a big forest fire in California.Since then,they have been trying to find out how the fire began.Forest fires are often caused by broken glass or by cigarette ends which people carelessly throw away.Yesterday the firemen examined the ground carefully,but were not able to find any broken glass.They were also quite sure that a cigarette end did not start the fire.This morning,however,a firemen accidentally discovered the cause.He noticed the remains of a snake which was wound round the electric wires of a 16,000-volt power line.In this way,he was able to solve the mystery.The explanation was simple but very unusual.A bird had snatched up the snake from the ground and then dropped it on to the wires.The snake then wound itself round the wires.When it did so,it sent sparks down to the ground and these immediately started a fire.
答案
A bird had snatched up the snake 发生在 He noticed the remains 前,符合过去的过去,故用过去完成.
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
- 7÷(x-2)=3.5(解方程)
- 用赏组词并填空:大加()赏
- 蝙蝠是靠接收自己的超声波来捕捉食物和躲避障碍物的 为了使夜间蝙蝠安全飞行 速度不能超过多大?
- 科学的,要判断某一标本是生物还是非生物,有时是非常困难的,这是因为?
- ( ) a Koala sleep during the day? Yes , it does
- does加动词原形的句子
- 如何理解feed me to feed you
- She likes to have friends who _______her.A like B likes C is like D both A and C
- 从冰箱中取出杯子,放在空气中,一会儿出现的现象是什么?原因是什么?
- 1.矩形ABCD中,AB=3,BC=4,如果将该矩形沿着对角线BD折叠BC与AD交于E,求三角形BED面积.(不会发图,已
热门考点