阅读理解。 There are many kinds of tigers all over the world, and the largest kind is Northeast Tigers (东北虎). Most Northeast Tigers live in the northeast of China, such as Heilongjiang Province and Jilin Province. There are many forests and mountains, and the tigers usually like living there. In the forests and mountains, there are fewer people getting out and coming in. So the tigers are very free. They run after each other, catch and eat some small animals like rabbits and deer (鹿). Northeast Tigers are different from other tigers. For example, Northeast Tigers can swim very well, but they can't climb trees. Northeast Tigers' hearing is good and they can hear very low sounds. Now the number of Northeast Tigers becomes smaller and smaller. We should try our best to protect them. 1. Most Northeast Tigers enjoy living in _____. A. mountains B. forests C. mountains and forests D. animal zoos 2. Northeast Tigers like living in the northeast of China because _____. A. they can be very free B. they can find food easily C. there are no tigers in the south D. it is beautiful there 3. Which of the following is NOT true? A. Northeast Tigers are the largest tigers in the world. B. Northeast Tigers can swim and climb trees very well. C. Now Northeast Tigers are becoming fewer and fewer. D. Northeast Tigers can hear low sounds. 4. What do you think we should do to protect Northeast Tigers? A. Give them enough food. B. Keep them in the zoo. C. Protect their living place. D. Make friends with them. 5. The best title of this passage is _____. A. Kinds of Tigers B. Tigers in China C. How to Protect Northeast Tigers D. Northeast Tigers