1. 阅读理解

Emotions such as fear and anxiety can make the heart beat faster. Now a study in mice has found that the opposite is also true—increasing the heart rate (心率) can raise anxiety levels.

To test the fact directly, Deisseroth with his team turned to a method that uses light to control cell(细胞) activity. The team trained the animals to react quickly to light and expect a shock if they pressed a handle for a water reward. Using the system, the team raised the animals' heart rates from their normal 660 beats per minute to 900. When their hearts started racing, mice became less willing to press the handle or to explore open areas, showing that they were more anxious. But for animals in other situations, the increased heart rate had no effect, suggesting that the brain and the heart worked together to produce anxiety.

When the researchers measured the animals' brain activity, they found that brain became more active when the heart rate increased if the animal was acting anxiously. It means that brain is in charge of joining signals from the heart with danger from the environment before they pass on the information to higher thinking areas.

1. （1） What is the result of the study in mice?

   A . Fear and anxiety will get the heart faster. B . Raising heart rate leads to anxious behavior. C . Bad emotions result in faster heart beat. D . Increased heart rate lower anxious level.
3. （2） How did Deisseroth with his team operate the test?

   A . By using light to control cell activity. B . By making mice have a shock. C . By forcing mice to drink some water. D . By teaching them to press a handle.
5. （3） What does the underlined word "suggesting" mean?

   A . Introducing. B . Accepting. C . Advising. D . Showing.
7. （4） What can we infer (推断) from the researchers' finding of Paragraph 3?

   A . The animal became less active when the heart rate raised if it was anxious. B . Brain takes charge of signals from the heart and danger from the environment. C . The heart-brain circle can help animals deal with danger signals more quickly. D . Animals' heart can help pass the information on to their higher thinking areas.
9. （5） What is the best title of the passage?

   A . Can Raising a Mouse's Anxiety Level Help Raise Its Heart Beat? B . Anxiety Can be Created by the Body, Mouse Heart Study Suggests C . Emotions Can Make the Heart Beat Faster, A Heart Study Suggests D . Does Deisseroth With His Team Use Light to Control Animals' Activity?