Test 9

　　Ⅰ.完形填空

　　Once again，science supports what your grandmother told you：A good night’s sleep helps your body fight a cold.

　　People who averaged fewer than seven hours of sleep per __1__ in the weeks before being exposed to the cold virus were nearly three times __2__ likely to get sick as those who __3__ eight hours or more，a new study found.

　　Researchers used frequent telephone __4__ to track the sleep __5__ of more than 150 men and women aged 21 to 55 over the course of a few weeks.Then they __6__ the subjects to the virus，quarantined them for five days and kept __7__ of who got sick.

　　__8__ sleeping more，sleeping better also seemed to __9__ the body fight illness：Patients who fared better on a measure __10__ as “sleep efficiency”—the percentage of time in bed that you’re actually sleeping—were also __11__ likely to get sick.

　　The results held __12__ even after researchers __13__ for variables such as body-mass index，age，sex，smoking and pre-existing antibodies to the __14__.

　　__15__ your grandmother，the researchers aren’t exactly sure __16__ sleeping better makes you less likely to __17__ a cold.But they __18__ take a stab at the answer：“Sleep disturbance influences the regulation of proinflammatory cytokines(促炎细胞因子)，histamines，and other symptom mediators that are released in response to infection.” In plain English，maybe tossing and turning when you’re __19__ with the cold virus __20__ to the symptoms that define a cold.

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