问题 单项选择题

有关中枢抑制性递质是()

A.γ-氨基丁酸钠、甘氨酸

B.谷氨酸、门冬氨酸

C.肾上腺素、去甲肾上腺素

D.多巴胺、酪氨酸

E.乙酰胆碱

答案

参考答案:A

计算题
阅读理解

阅读理解。

     Are morning people born or made? In my case it was definitely made. In my early 20s, I rarely went to

bed before midnight, and I would almost always get up late the next moming.

     But after a while I couldn't ignore the high relationship between success and rising early. On those rare

occasions where I did get up early, I noticed that my productivity was almost always higher. So I set out

to become a habitual early riser. But whenever my alarm went off, my first thought was always to stop that

noise and go back to sleep. Eventually some sleep research showed me that I was using the wrong strategy.

     The most common wrong strategy is this: You assume that if you're going to get up earlier, you'd better

go to bed earlier. It sounds very reasonable, but will usually fail.

     There are two main schools (流派) of thought on sleep patterns. One is that you should go to bed and get

up at the same time every day. The second says you should go to bed when you're tired and get up when you

naturally wake up. However, I have found both of them are wrong if you care about productivity.

     If you sleep at set hours, you'll sometimes go to bed when you aren't sleepy enough. You're wasting time

lying in bed awake and not being asleep. If your sleep is based on what your body tells you, you'll probably

be sleeping more than you need. Also, your mornings may be less predictable if you're getting up at different

times.

     The solution for me has been to combine both methods. I go to bed when I'm sleepy and get up with an

alarm clock at a fixed time. So I always get up at the same time (in my case 5 a.m.), but I go to bed at

different times every night-sometimes at 9:30 p.m. and other times at midnight. Most of the time I go to bed

between 10-11 p.m.

     However, going to bed only when I'm sleepy, and getting up at a fixed time every morning is my way. If

you want to become an early riser, you can try your own.

1. According to the passage,the underlined phrase refers to _____. [ ]

A. people who stay up until the next morning

B. people who get up early in the morning

C. people who feel sleepy in the morning

D. people whose productivity is the highest in the morning

2. Why did the author want to become a habitual early riser? [ ]

A. Because he/she wanted to form the habit of going to bed early and getting up early.

B. Because he/she had found that his/her productivity was higher when he/she got up early.

C. Because he/she wanted to see which of the two main schools of thought on sleep pattems was right.

D. Because he/she was told the high relationship between success and rising early.

3. The author experienced all the following EXCEPT_____. [ ]

A. going to bed after midnight

B. getting up early occasionally

C. pressing off the alarm to go on sleeping

D. asking scholars for advice on sleeping habits