1. (2022七下·温州期中) 阅读理解

Do you play with your phone before bedtime? According to a US study, looking at screens at night can cause us to sleep not well.

In the evening, our brains make melatonin. Melatonin helps us feel sleepy and relaxed. It's an important part of our sleep cycle. Our electronic screens stop that cycle from working normally.

Why? Phones, computers and TVs make blue light. Blue light stops our bodies from making melatonin. Even just a little bit of blue light can have an effect. Eight minutes of blue light can keep your brain "awake" for another hour, according to the study. Even when you are sleeping, you may have lots of dreams. Your brain won't have a good rest.

It's even worse if you play an exciting game before bed. Games make our hearts beat faster, so we have a harder time falling asleep. Then, when we are sleeping, we don't get enough "deep sleep".

Will you play with your phone before sleep now?

1. （1） What is the story mainly about?

   A . How to get a good sleep. B . Why scientists need to study sleep. C . How playing with phones causes bad sleep. D . Why some people have lots of dreams. 
3. （2） Which of the following about melatonin is TRUE?

   A . Too much of it makes us sleep not well. B . It makes us hungry and tired. C . It helps us fall asleep at night. D . It stops our sleep cycle from going normally.
5. （3） How do mobile phones' screens make us hard to sleep?

   A . They cannot make us feel relaxed. B . Their blue light stops our sleep cycle. C . They make more melatonin than our bodies need. D . Our brain need more time to make dreams.
7. （4） What does the underlined word "awake" mean?

   A . feeling nothing B . dreaming a lot C . having a rest D . being not sleeping