▲閱讀下文，回答第 38－41 題
      The Coronavirus Disease 2019 (COVID-19), according to scientists, may be caused by a new coronavirus ( 新冠狀病毒 ) which originally came from animals. As populations grow,humans develop animal farming and disturb wildlife. They may then pick up viruses from wild animals, which sometimes has serious consequences.
       In the last fifty years, a number of diseases have spread to humans from animals like bats, birds, and pigs. In the 1970s, the Ebola virus jumped from bats in Africa and has so farkilled tens of thousands of people. In 2003, the virus which caused the Severe Acute Respiratory Syndrome (SARS) was also likely to come from bats. It showed similarities with the newcoronavirus. Since 1997, the spread of human infections with the bird flu virus has also been reported in various countries.
      For a long time, animals have played an important role in human life. However, health officials warn that animals can sometimes appear healthy even when they are sick. Viruses movefrom animals to humans in several ways. One is through direct contact, such as being bitten or scratched by an infected animal. Another way is indirect contact when people touch objects with viruses left by infected animals. A third way is from insect bites. Mosquitoes, for example, can spread diseases when they bite people after feeding on infected animals. Experts suggest that people protect themselves by building good hygiene habits. They should avoid being bitten,handle food safely, and always wash their hands after being around animals. Staying healthy is very important as the new coronavirus would not be the last virus to jump from animals to humans.
38. What is the main idea of the passage?
(A) Animals pass on viruses which kill large numbers of humans.
(B) Animals become ill when they live near human populations.
(C) People have to be careful about diseases coming from animals.
(D) People can prevent infections in animals with good hygiene habits.