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问题 单项选择题

由于人畜体内有高活性的酰胺酶和羧酯酶，对乐果有较强的解毒能力，当乐果进人人畜体内后，会很快地分解成无毒的物质。而乐果进入虫体以后，将变成更毒的物质。
以下哪项，从上述题干中推出最为恰当

A．乐果对人畜，害虫都具有高效。

B．乐果对人畜，害虫都只有低毒。

C．乐果对害虫有高效，而对人畜只有低毒。

D．乐果对人畜有高效，而对害虫只有低毒。

答案

参考答案：C

解析：读完此题之后就应该看出正确答案为C项。

选择题

唐朝《水轮赋》描述当时发明的一种工具：“水能利物，轮乃曲成。升降满农夫之用……终夜有声。”文中描述的工具是

筒车           B．桔槔              C．水排               D．翻车
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单项选择题

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’s basic understanding of the world around it. This is the infant’s first introduction to the language that shapes perception and elicits emotion.
Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.
Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.
In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

In this passage, agents of socialization refer to ______.

A．the media

B．individuals

C．all channels

D．organizations
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