Hurry up! The black clouds ______that it is g...

Hurry up! The black clouds ______that it is going to rain soon.

高二英语单项填空简单题查看答案及解析

— I hear it will rain tomorrow.

— It _______ true. You see, there are so many black clouds in the sky now.

A．won’t be         B．will be            C．may be           D．may not be

高二英语单项填空中等难度题查看答案及解析

There are many black clouds. It is _______ to rain again.

A. surely           B. probable        C. likely         D. possible

高二英语单项填空中等难度题查看答案及解析

It is well known to car drivers that red means “stop”, green means “go” and yellow means “hurry up and make that damn light”. Why those colors, though? The answer lies in the fact that the earliest traffic signals were designed for trains, not cars. They were red and green, gas-powered, and more than a little dangerous in the event of a leak.

Red is an inherited (继承的) symbol from railroads, which symbolizes danger in many cultures. As red has a longer wavelength than any other color on the visible spectrum (光谱), it can be seen from a greater distance than other colors. Red has meant “stop” since long before cars existed, with train signals’ use of red dating back to the days when mechanical arms lifted and lowered to indicate whether the rail ahead was clear.

Green’s wavelength is next to (and shorter than) yellow’s on the visible spectrum, meaning it’s still easier to see than any color other than red and yellow. Back in the early days of railway lights, green meant “caution”, while the “all-clear” light was, well, clear or white. It is said that several disastrous collisions happened after an engineer mistook stars in the night for an all-clear. Thus, green became “go”, and for a long time, railways used only green and red to signal trains.

From the earliest days of motoring up until mid-1900s, not all stop signs were red-many were yellow, because at night it was all but impossible to see a red stop sign in a poorly lit area. In 1950 the yellow stop-sign craze began in Detroit, a city that five years later installed its first electric traffic signal, which happened to include the very first yellow traffic light.

But what of those mysterious yellow stop-signs? As materials and technologies evolved, the ability to produce highly reflective signs meant that red could resume its natural spot in the sign hierarchy (层次体系，等级体系), leaving the still-highly-visible yellow to the domain (领域) of “caution”. That’s why school zones and buses, crosswalks, and other important warnings are yellow today.

1.What’s the main reason for the color red’s long being used to mean “stop”?

A.It has the longest wavelength on the visible spectrum.

B.It represents danger in many cultures.

C.It can be seen even in the dark area.

D.People prefer red to other colors.

2.Which of the following may the author agree with?

A.The meaning of red is culture–specific.

B.Yellow functioned as stop signs in the 1900s.

C.Green’s wavelength is just second to that of red.

D.Green’s role in traffic lights has changed over time.

3.What does the passage mainly talk about?

A.The significance of road traffic signs.

B.The history of railroad transportation.

C.The symbolic meaning of different colors.

D.The origin and development of traffic lights.

高二英语阅读理解中等难度题查看答案及解析

--- Is it going to rain tomorrow?

--- I’m afraid _______.

A．so               B．this              C．to               D．that

高二英语单项填空中等难度题查看答案及解析

----   It’s raining heavily! Why must we go out right now?

---- The reason is that we are going to help the villages on the mountains.

---- ______.

高二英语单项填空中等难度题查看答案及解析

It is in the west of China _____  _____ is no doubt that it is going to rain tomorrow.

A．where; there      B．that; there         C．that; it            D．where; it

高二英语单项填空中等难度题查看答案及解析

It is reported that the guy who is going to _________ the lecture spent a year living in the rain forest.

A. refresh        B convey         C. deliver     D. convince

高二英语单项填空简单题查看答案及解析

— Look! Black clouds are gathering.— Yes. A heavy rain is ______  to come.

高二英语单项填空中等难度题查看答案及解析

--- Do you suppose it is going to rain over the weekend?

--- _______.

高二英语单项填空简单题查看答案及解析