根据下列句子的意思及所给汉语注释写出单词，每空一词。
____ Children must wash their clothes __________ (他们).
____ We can find the kind-hearted person __________ (到处).
____ There were two traffic __________ (事故) in the street last month.
____ His parents don't __________ (允许)him to go out alone at night.
____ Anna is a__________ (当心的) girl , she makes few mistakes in her homework.

下面材料中“民族革命统一战线”的任务是（    ）

西瓜的果肉属于植物哪类组织？（    ）

如图表示有关概念之间的关系，如表选项中和图示不相符的是（　　）