2. 外语
  3. Cream is a yellowish oil-in-water______ which forms when milk is allowed to stand.

Cream is a yellowish oil-in-water______ which forms when milk is allowed to stand.

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问题 Cream is a yellowish oil-in-water______ which forms when milk is allowed to stand.
选项 A、emulsion
B、albumen
C、embrocation
D、yolk
答案A
解析 四个选项的意思分别是：emulsion乳剂；albumen蛋白；embrocation擦剂；yolk蛋黄。句意是，奶油是一种淡黄色的水包油乳剂，牛奶凝固就可形成奶油。所以正确答案是A选项，如：additives for photographic emulsion(感光乳剂添加剂)。
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