The sheets are damp with sweat. You’re cold, but your heart is racing as if a killer just chased you down a dark street. It was

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问题    The sheets are damp with sweat. You’re cold, but your heart is racing as if a killer just chased you down a dark street. It was just a nightmare, you tell yourself; there’s nothing to be afraid of. But you’re still filled with【C1】________.
Given how unsettling and haunting nightmares can be, is there a way for dreamers to【C2】________, or even turn off, these bad dreams as they happen?
Research is【C3】________, but some studies suggest that people who can master lucid dreaming—that is, the ability to be【C4】________that a nightmare is happening and possibly even control it without waking up—may hold the【C5】________.
Nightmares are part of the human experience, especially for kids. Doctors【C6】________don’t consider occasional nightmares a problem. They can just be symptoms of a sleep disorder that can【C7】________from an unpleasant experience, stress, or certain drugs.
To treat the disorder, there are a number of medicines and therapies that are backed by【C8】________research, according to the American Academy of Sleep Medicine, which analyzed the available research on the treatment of nightmare disorder in a recent【C9】________published in the Journal of Clinical Sleep Medicine.
However, nightmares are complicated, and researchers are still struggling to understand them, said Dr. Rachel Salas, an expert on sleep disorders and an associate professor at Johns Hopkins Medicine in Baltimore. What we do know is that people【C10】________to have different kinds of nightmares at different points during the sleep cycle.
A)  amount
B)  answer
C)  avoid
D)  aware
E)  depart
F)  drastically
G)  fear
H)  limited
I)  mechanical
J)  result
K)  review
L)  rigorous
M)  tend
N)  timidity
O)  typically
【C3】

选项

答案H

解析空格前有is，因此空格处应填入形容词或动词的-ed形式或-ing形式。本句意为：研究是________。本句信息较少，无法直接推断出答案。根据后一分句“但有一些研究表明……”可知，空格处所表达的意思应与后一分句成转折关系，可以推出目前的研究还有限，结合备选形容词词义，可确定答案为H)limited。另外几个备选词中，D)aware的主语是人，I)mechanical不能修饰research，rigorous与后面的分句不能构成转折关系，故排除。

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大学英语四级

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