大学英语六级题库/阅读理解 Section A

Part Ⅲ Reading Comprehension (40 minutes)

Section A
Directions : In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. Please mark the corresponding letter for each item on Answer Sheet 2 with a single line through the centre. You may not use any of the words in the bank more than once.

    Half of your brain stays alert and prepared for danger when you sleep in a new place. a study has revealed. This phenomenon is often   26   to as the "first-night-effect". Researchers from Brown University found that a network in the left hemisphere of the brain "remained more active" than the network in the right side of the brain. Playing sounds into the right ears (stimulating the left hemisphere) of  27  was more likely to wake them up than if the noises were played into their left ears.                         

    It was  28   observed that the left side of the brain was more active during deep sleep.When the researchers repeated the laboratory experiment on the second and third nights they found the left hemisphere could not be stimulated in the same way during deep sleep. The researchers explained that the study demonstrated when we are in a   29 environment the brain partly remains alert so that humans can defend themselves against any   30   danger.

    The researchers believe this is the first time that the "first-night-effect" of different brain states has been  31   in humans. It isn't, however, the first time it has ever been seen. Some animal   32   also display this phenomenon. For example, dolphins, as well as other   33 animals, shut down one hemisphere of the brain when they go to sleep. A previous study noted

that dolphins always  34   control their breathing. Without keeping the brain active while sleeping, they would probably drown. But, as the human study suggests, another reason for dolphins keeping their eyes open uring sleep is that they can look out for 35   while asleep. It also keeps their physiological processes working.

A. classified

B. consciously

C. dramatically

D. exotic

E. identified

F. inherent

G. marine

H. novel

I. potential

J. predators

K. referred

L. species

M. specifically

N. varieties

0. volunteers


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                      参考答案: B,M,G,L,K,J,H,O,E,I