Text … The decrease【C1】______blood pressure occurred【C2】______race or【C3】______and whether or not study participants are a

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问题                           Text
   …
   The decrease【C1】______blood pressure occurred【C2】______race or【C3】______and whether or not study participants are a "typical American diet",【C4】______is high in saturated fats and contains few fruits and【C5】______or the so-called DASH(for Dietary Approaches to Stop Hypertension)diet, which emphasizes lots of fresh【C6】______, low-fat diary, fish and fewer sweets and which was proved in 1997 to reduce hypertension. The biggest decrease in blood pressure in this study was recorded in subjects who ate the DASH diet and reduced their sodium【C7】______to 1 200mg a day.
   Why is this significant?【C8】______-health experts estimate that Americans consume, on average, about 3 500 mg of sodium—【C9】______about 9 grams of salt — daily. It’ s not【C10】______we’ re that heavy-handed with the saltshaker. Most of our dietary sodium is added【C11】______food processing.【C12】______to 1 200mg, you’d have to forgo most【C13】______foods, take-out deliveries and restaurant meals.
   So pay attention【C14】______how much salt you’ re eating, but don’ t forget to make fruits, vegetables and whole grains a【C15】______part of your diet. They’ ll help【C16】______your cholesterol level【C17】______your blood pressure. Be sure to drink alcohol【C18】______, if at all.【C19】____________weight—even just 4.5kg—and exercising at least 30 minutes most days of the week can also have a marked【C20】____________on blood pressure.
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【C4】

选项 A、which
B、that
C、what
D、who

答案A

解析 考查非限定性定语从句的引导词,应由which引导。
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