题目

阅读理解 Adults are happy to tell their children that crusts (面包皮) will give them curly hair, carrots will help them see in the dark, and spinach will make them strong. Even though adults know it's not totally true, they think it's good for their children's health, a study had found. In a study about 31 per cent of adults said they once told their children the curly hair tale, and 36 per cent said they'd been told the same thing by their mother or father. Among the over-50s, almost half said they'd been promised curly hair if they ate their crusts. A quarter of the 2,000 adults quest13．如图所示实验设计不能达到实验目的是（　　）A．除去氢气中的氯化氢气体B．验证可燃物燃烧的两个条件C．验证X溶液中是否含有Cl-D．获取氯化钠晶体