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【单选题】

Chocolate to Live For!
A study published in the Journal of the American Medical Association in 2003 reported that dark chocolate may lower your blood pressure. Researchers at the University of Cologne studied men and women who were recently diagnosed with mild high blood pressure. Half were given 100g (fabout 3.5 ounces) of dark chocolate per day and half were given white chocolate. After only two weeks systolic (收缩的) blood pressure decreased on average by five points and diastolic (以及舒张的) blood pressure by two points in those consuming dark chocolate, but not those consuming white chocolate.
In a similar study, researchers from Italy reported in the American Heart Association journal Hypertension that 3.5 ounces of dark chocolate for one week lowered systolic blood pressure by 12 points and diastolic blood pressure by 8.5 points when blood pressure was monitored continuously for 24 hours. Insulin (胰岛素) sensitivity and LDL cholesterol also improved. No benefits were seen with white chocolate. Another study published in the Journal of the American College of Cardiology found that chocolate may help repair damage to smokers’ blood vessels, at least temporarily.
why Chocolate increases your body’ s production of nitric oxide (一氧化氮), a powerful substance that causes your blood vessels to relax and dilate. This, in turn, causes an increase in blood flow and a decrease in blood pressure--like opening a water spigot (水龙头). A study published in July in the Journal of the American Medical Association reported that just 30 calories per day of dark chocolate lowered blood pressure and increased nitric oxide production after 18 weeks.
Nitric oxide is also stimulated by drugs such as Viagra and Levitra, which increase blood flow to the and enhance erections. This may be one of the reasons why chocolate has had a long reputation as an aphrodisiac (壮阳药). Casanova (卡萨诺瓦) is said to have considered it as his "favorite breakfast dish. " Chocolate also contains phenylethylamine (苯乙胺), which research suggests is a stimulant that is released when you’ re interacting with someone intimately.
Chocolate to Live For!Chocolate has long been considered as an aphrodisiac because

A.
it increases the production of nitric oxide.
B.
it increases blood flow to the and enhances eruptions.
C.
it lowers both systolic and diastolic blood pressures.
D.
it helps to repair damage to blood vessels in the body.
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【单选题】水龙头的扶正轴承磨损时,会出现()的故障。

A.
中心管转动不灵
B.
冲管密封漏修井液
C.
中心管径向摆动差增大
D.
油池漏油

【单选题】一氧化氮不具有下列哪一项作用:

A.
抑制中性粒细胞与内皮细胞的黏附
B.
血管平滑肌舒张
C.
收缩支气管平滑肌
D.
抑制血小板黏附和聚集
E.
具有内皮细胞保护作用