Practice 1　　Once again, science supports what your grandmoth

Practice 1　　Once again, science supports what your grandmother told you: A good night’s sleep helps your body fight a cold.　　People who (1)______ fewer than seven hours of sleep per night in the weeks before being (2)______ to the cold virus were nearly three times as likely to get sick as those who averaged eight hours or more, a new study found.　　Researchers used frequent telephone (3)______ to track the sleep habits of more than 150 men and women aged 21 to 55 over the course of a few weeks. Then they exposed the (4)______ to the virus, quarantined (隔离) them for five days and kept track of who got sick.　　(5)______ sleeping more, sleeping better also seemed to help the body fight illness: Patients who fared better on a measure known as “sleep efficiency”—the percentage of time in bed that you’re (6)______ sleeping—were also less likely to get sick.　　The results held true even after researchers adjusted for (7)______ such as body-mass index, age, sex, smoking and pre-existing antibodies to the virus.　　Like your grandmother, the researchers aren’t exactly sure why sleeping better makes you less likely to develop a cold. But they do take a stab at the answer: “Sleep (8)______ influences the regulation of proinflammatory cytokines, histamines, and other symptom mediators that are released in (9)______ to infection.” In plain English, maybe tossing and turning when you’re infected with the cold virus (10)______ to the symptoms that define a cold.[A] subjects　　　　　　[B] disruption　　　　　 [C] exposed[D] contributes　　　　 [E]interviews　　　　　　[F] Despite[G] actually　　　　　　[H] properties　　　　　 [I]response[J]variables　　　　　　[K]action　　　　　　　　[L]averaged[M]Besides　　　　　　　[N]partially　　　　　　 [O]disturbance