1. (2021九上·杭州开学考) 阅读下列短文，从每题所给的四个选项（A、B、C和D）中选出最佳选项。

Because of the outbreak of the COVID-19, many people are wearing masks to make themselves healthy. It's a very simple but useful way to protect people from lots of harmful things. In fact, masks have been helping humans for centuries.

1st century

At that time, many people in Roman Empire worked underground. But most of them died of respiratory（呼吸的）illnesses. To solve this problem, a Roman advised people to use animal skins to stop dust. His idea was considered the very first recorded mask invention.

16th century

Early inventions did not stop. Many centuries later, an Italian suggested using clothes which were wet over the face to protect against the infection(传染).

19th century

In 1897, a doctor called Johann designed a simple mask composed of one layer(层)of gauze(纱布)，asking medical workers to wear it to stop infection. That was the first recorded use of a surgical(外科的)mask.

20th century

In 1910, a disease(疾病)broke out in Northeast China. Chinese doctor Wu Liande made a cheap face mask called "Wu's mask". Made of two layers of surgical gauze, it was praised by experts around the world, because it was simple to make and had a low production cost.

Modern exploration

With some outbreaks of diseases and the rise of environmental pollution caused by much waste, the materials in masks have continued to evolve(进化)to better protect its wearer. For example, when facing smog, mask models such as N95 and KN90 became highly popular. In the future, mask will continue to improve, hopefully so will the habits of humans.

1. （1） Why do people wear masks?

   A . To avoid being discovered. B . To make themselves healthy. C . To pass on the tradition. D . To express shame to others.
3. （2） Which is the right process of the history of the masks?

   A . Wet clothes → animal skins → N95→ gauze masks B . Animal skins → wet clothes → gauze masks → N95 C . Animal skins→ gauze masks → KN90 → wet clothes D . Animal skins → wet clothes → KN90→ gauze masks
5. （3） What does the underlined word "it"refer to?

   A . Wu's mask. B . Surgical gauze. C . The disease. D . Low production cost.
7. （4） What can you infer from the sentence in bold(粗体)in the last paragraph?

   A . The writer hopes making masks can change humans' habits. B . The writer hopes humans will wear masks to look healthy. C . The writer hopes humans can improve themselves better. D . The writer hopes wearing masks will be humans 'habit.