皮皮学，免费搜题
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【单选题】
People in many cultures shared similar ideas about garlic. For example, it was believed that garlic made it possible for slaves to work harder and longer. In Greece, the athletes of the first Olympic Games ate garlic, because they wanted to become stronger and faster. ________3_________. In some places, garlic was called “food for lovers”. People added it to other foods because it tasted good.A.
But garlic wasn't only for slaves and athletes.
B.
It was supposed to make a cold or fever go away.
C.
In China, people also used garlic to keep meat fresh.
D.
Maybe you don't know that garlic has a long history.
E.
Recent research shows that garlic is bad for our health.
F.
Other people say it tastes great and it's good for you, too.
G.
However, we can't accept every idea about garlic from the past.
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举一反三
【单选题】菌斑的获得性膜结构的功能不包括
A.
修复或保护釉质表面
B.
影响微生物对牙面的附着
C.
为菌斑微生物提供营养
D.
为釉质提供有选择的渗透性
E.
利于抗生素发挥作用
【单选题】获得性膜功能不包括
A.
修复或保护釉质表面
B.
为釉质提供有选择的渗透性
C.
影响特异性口腔微生物对牙面的附着
D.
作为菌斑微生物的底物和营养
E.
是牙齿防御系统的组成部分
【单选题】下列叙述正确的是（）
A.
相对分子质量相同，结构不同的化合物一定互为同分异构体
B.
含不同碳原子数的烷烃一定是同系物
C.
结构对称的烷烃，其一卤代物必定只有一种结构
D.
组成通式相同且组成上相差一个或多个“CH 2 ”原子团的物质互为同系物
【单选题】下列关于有机物的叙述正确的是
A.
所有烷烃和糖类中都存在碳碳单键
B.
丁烷有两种同分异构体
C.
甲烷与氯气混合光照后黄绿色消失，是因为发生了加成反应
D.
向蛋白质溶液中加入饱和食盐水，蛋白质析出，加水也不溶解
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