29. What can we learn about white-nose syndrome in Paragraph 2?

A. Many bats have died of it in America

B. It is spreading fast in the world

C. Nobody knows how bats get it.

D. It is threatening many animals

30. Which of the following might Marco Carvello agree with?

A. The disease has led to people 's strange behavior

B. The disease may cause the disappearance of bats

C. The government should control the spread of the disease

D. The decrease in the bat population can greatly affect humans 'life

3 l. What does the author mainly tell us in the passage?

A. A bat species is decreasing in number

B. We have found ways to protect bats

C. A disease causes many deaths of bats

D. We should have a high opinion of bats

　D

　　A university says that they have brought out a medical invention that can help people with disabilities stand up and walk. Researchers at Switzerland's Technical University have made TWIICE, a robotic device that can help a person with paraplegia (截瘫) of the legs to walk. It is called TWIICE because it gives those people a second chance.The researchers say this device could help nearly 800,000 people in India who cannot move the lower half of their body.

　　" It really has enough strength to walk even if the person themselves does not have the strength to walk. And it can even be used to climb the stairs.The device is used for helping people who are fully paraplegic, people who have spinal cord （脊髓）Injury， or people who really cannot even move or feel their legs, "said Roman Baud, a PHD Student at EPFL, Switzerland's Technical University.

Developers at the university say TWIICE is the first smart device to help physical activity in the world that can recognize the loss of balance and can prevent