《环境电磁波卫生标准》（GB9175-88）中，将环境电磁波容许辐射强度标准分为两个

有人认为：“过去五千年的中华通史，实为一部‘帝王专制史’；而现代的中华通史，则是一部‘民主政治史’”。从“过去”到“现代”的历史分界点应该是下列选项中的 

A．鸦片战争

B．辛亥革命

C．新文化运动

D．五四运动

Fruit and vegetables should be a part of what we eat every day. Educating your children about the importance of eating fruit and vegetables is important for their health. Here are some fun activities to help you teach your children about fruit and vegetables.

★ Reading is one excellent way. Choose a colorful book with many different types of fruit and vegetables.

★ Provide your children with fruit and vegetable puzzles. Your children will be able to see what fruit and vegetables look like as they’re putting the puzzles together. You can also teach them the different names of fruit and vegetables.

★ Each day give your children different fruit and vegetables to eat. This will give them the chance to taste many kinds of fruit and vegetables. Talk to your children about what they look like and how they taste and smell.

★ Play fruit and vegetable games. Prepare little cups with fruit and vegetables cut up into small pieces. Cover your children’s eyes and give them one of the cups to try. After tasting, they have to guess what kind of vegetable or fruit it is.

★ Grow vegetables. You can teach your children how vegetables grow by planting them. Your children will also learn how to take care of vegetables.

Judge the following sentences true ( T ) or false ( F ) according to the passage.

小题1: Reading is a good way to help your children know about fruit and vegetables.

小题2:The puzzles can help children know how fruit and vegetables taste and smell.

小题3: By playing fruit and vegetable games, children can know what fruit and vegetables look like.

小题4: Growing vegetables can teach your children how to look after vegetables.

小题5: The passage is mainly about the advantages of eating fruit and vegetables.

下列说法中正确的是（　　）

①具有相同质子数的一类原子总称为元素；

②相对原子质量表示的是1个原子的质量；

③由同种元素组成的单质叫纯净物；

④相对原子质量是个比值，它没有单位；

⑤由氧元素和另一种元素组成的化合物叫氧化物；

⑥高锰酸钾中含有氧元素，但它不是氧化物；

⑦水中含有氧元素，所以它是氧化物；

⑧将白磷放在空气中，会逐渐变成氧化物．

A．①②

B．①③④⑤

C．①⑤⑥⑧

D．全都不正确

软件详细设计的主要任务是( )。

A．确定每个模块的算法和使用的数据结构

B．确定每个模块外部的接口

C．确定每个模块的功能

D．编程

应首先做的检查是

A．钡餐检查

B．腹部触诊

C．B超检查

D．钡灌肠检查

E．CT检查