1. Bees work and they are good at honey.
2. Experts put on the backs of the bees, and there are some with sensors at the hives' entrances.
3. The cameras can tell experts the bees leave or come back to the hive.
4. Experts that most of bees left the hive a few minutes,about 34% bees leave two hours or more, they wanted to find more food.

二、阅读短文,完成下列各题。
To make your body keep healthy, your body has many things to do. One of these things is called reflex. A reflex is something you do not choose to do,but it happens when your body reacts quickly to something. Your body uses reflexes to protect itself. In fact,there are over forty reflexes.
Reflexes are useful and helpful. For example,when you breathe in dust or harmful germs,your body makes you sneeze to push the bad things out quickly. Coughing is another reflex that helps you make the dust and harmful germs out of your body. Also,blinking your eyelids is a reflex. When the sunshine or the lamplight is too bright,your eyelids can close themselves to prevent the hurt from the strong light. Moving quickly is a reflex too. If you touch something very cold or hot,you will perhaps move your body parts away so quickly that you even don't think about it. The reason is that your body does not wait for the brain to think it over and decide what to do. Your body parts move quickly so that your body can protect itself from the very cold or hot things.
词汇积累
reflex /'ri:fleks/ 反射动作;本能反应
react /ri'ækt/ 起反应
breathe /bri:ð/ 呼吸
germ /dʒɜːm/ 细菌
blink /blɪŋk/ 眨眼
eyelid /'aɪlɪd/ 眼皮;眼睑
prevent /prɪ'vent/ 阻止
perhaps /pə'hæps/ 可能
(一)根据短文内容,选择正确的答案。
( )1. At night,you may ______ when you turn on the light.
A. open your eyes wide
B. blink your eyelids
C. dance and sing happily
D. move quickly as possible as you can
( )2. What is the meaning of the underlined word "sneeze"?
A. 打哈欠
B. 打喷嚏
C. 擤鼻涕
D. 咳嗽
( )3. What is the main idea of the text?
A. Sneezing and moving quickly are important reactions.
B. Your eyelids help you look beautiful and bright.
C. Your body uses different reflexes to protect itself.
D. Your body can't stop coughing even though you don't want to cough.
(二)根据短文内容,写出身体的四个本能反应。______ ______ ______ ______
(三)你知道身体的其他本能反应吗？试举出一例并进行描述。______