—At this special time of the COVID-19, we hav...

—At this special time of the COVID-19, we have to wear masks (口罩)if we go out.

—________. It is responsible for ourselves and others.

A.Never mind B.I agree C.Sorry D.Not at all

九年级英语单选题简单题查看答案及解析

We ________ wear masks to keep away from COVID-19 in public.

A.must B.may C.can D.need

九年级英语单选题简单题查看答案及解析

— When can we stop wearing masks?

— Not until COVID-19 ______.

A.will control B.is controlled C.will be controlled

九年级英语单选题中等难度题查看答案及解析

The sky in Zhengzhou these days is even 　　　　 , so we don’t have to wear the masks.

A. more clearly B. more clearlier C. fresher D. more fresher

九年级英语单选题中等难度题查看答案及解析

When you watch 3D movies or TV，you have to wear a special pair of glasses．The 3D glasses make the images from the screen look like they are there in the room with you．

Three-dimensional，or 3D，means having three dimensions（维度） : width，height and depth．3D technology（技术） is based on the way the human brain（大脑） and eyes work．Because the pupils of a person's eyes are about 6．5era apart（分开），when we look at something，each eye sees it from a different angle（角度）．Our eyes send the two images to our brain，and the brain puts them together．The small difference between the image from the right eye and the image from the left eye allows us to see depth．

When we view pictures and television in two dimensions，each eye gets the same information．That is because the image has no real depth，and there is only one of viewing it．So the goal of 3D technology is to get a different image into each of the viewer．It uses two film projectors．One projects a left eye image and the other projects a right image．The 3D glasses allow us to see a different image in each eye．

While watching 3D films，we feel that we are in the same environment as the things we're watching．However，it also has its disadvantages．The 3D glasses work by controlling the amount of light that reaches the eyes．It makes the screen look darker．What's more，people with eye problems may get headaches if they spend too much time watching 3D movies，because their brains need to work harder to "read" the images．

1.According to the passage，we can see 3D TV with the help of ____．

A．the exciting games　　　　　　　　　　　　 B．the special glasses

C．the dark screen　　　　　　　　　　　　　　 D．the image in the room

2.The second paragraph mainly tells us ____．

A．how we see things in 3D

B．how 3D films are made

C．what the human brain does for our eyes

D．how different images get into the brain

3.The underlined word "pupils" in the passage means____ in Chinese．

A．学生　　　　　　 B．视线　　　　　　 C．睫毛　　　　　　 D．瞳孔

4.Which of the following is TRUE?

A．3D glasses make the screen look brighter．

B．People with eye problems can't see 3D films．

C．A 3D film needs making by two film projectors．

D．3D glasses held people get the same image in each eye．

九年级英语阅读理解中等难度题查看答案及解析

Because of the outbreak of the COVID-19, I have to teach myself English online.

A.find myself B.enjoy myself

C.learn…by myself D.teach…by myself

九年级英语单选题中等难度题查看答案及解析

There’s no need to hurry. The plane will 　　　　　 at 19:00. We have plenty of time.

A. put off　　 B. take off　　 C. get off　　 D. turn off

九年级英语单选题中等难度题查看答案及解析

During the 2020 Spring Festival, many people have to 　　　　 at home because of the COVID-19（新型冠状肺炎疫情）.

A.stay B.staying C.stayed D.stays

九年级英语单选题中等难度题查看答案及解析

Due to the outbreak of the novel coronavirus pneumonia, many people are wearing mask to reduce the risk of infections (感染). It’s a very simple but incredibly useful method to protect oneself from a variety of harmful things. In fact, masks have been helping mankind for centuries.

1st century

In that era, many people in Roman Empire work underground in mines to support their families. But most of them suffered from and even died of respiratory (呼吸的) illness. To solve this problem. Pliny the Elder (23-79 AD) a Roman naturalist, recommended the use of animal skins to stop dust from being breathed. His ideas was considered the very first recorded mask inventions.

16th century

Many centuries later, the artist and inventor Leonardo da Vinci (1452-1519) in Italy, suggested using a wet cloth over the face to protect against the poisonous chemicals.

19th century

The design of the mask took a big forward in the 19th century. In 1848, American Lewis Hassley became the first person to patent (注册专利) a protective mask for miners. Masks at this stage were similar to gas mask Later. in 1897. Polish-Austrian doctor Johann von Mikulicz Radecki designed a simple mask with one layer of gauze (纱布), recommending medical workers to wear it to prevent infection. That was the first recorded use of masks for surgeons.

20th century

In 1910, a terrible disease broke out in Northeast China Chinese doctor Wu Liande designed a cheap face mask called “Wu’s mask”. Made of two layers of surgical gauze, it could be fixed around the back of the head and tied in a knot. This mask was praised by experts around the world, as it was simple to make and had a low production cost.

Modern exploration

With several outbreaks of infectious diseases and the flu and the rise of pollution caused by industrial waste, the materials in masks have continued to evolve ( 进 化 ) to better protect its wearer. For example, in 2012 when China suffered from smog, mask models such as N95 and KN90, which can filter out this fine particulate (微粒) matter, become highly popular. In the future, masks will continue to improve, hopefully so will the habits of humans.

Title: The 1. of mask through the ages

九年级英语填空简单题查看答案及解析

Because of COVID-19, we are facing _______ increasingly challenging time now. But better days will return, and success will belong to every one of us.

A.a B.an C.the

九年级英语单选题中等难度题查看答案及解析