对,答案是A.
是因为这句话前边已经提到科学家给出减少使用染料的警告,特别是哪些呢?that used on childen's...
especially后面特指的小孩子的玩具和家具,前边没有主语了,不能用which is,所以用that来做代词代指后面的小孩子的玩具和家具.这里应该用that引导的宾语从句.
Scientists have given a warning to reduce the amount of lead
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