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问题 单项选择题

电气设备分为高压和低压两种：（）。

A、高压电气设备：电压等级在1000V及以上者；低压电气设备：电压等级在1000V以下者；

B、高压：设备对地电压在250V以上者；低压：设备对地电压在250V及以下者；

C、高压：设备对地电压在500V以上者；低压：设备对地电压在500V及以下者。

答案

参考答案：A

完形填空

Why is pink or purple a color for girls and blue or brown for boys?

The answer depends largely    小题1:   cultural values as well as personal experiences. To the Egyptians, green was a color   小题2:  represented the hope and joy of spring, while for Muslims, it means heaven. Red is a symbol of good luck in many cultures. During the Spring Festival in China, children    小题3:  (give) money in a red envelope to bring good fortune in the New Year. For many nations, blue is a symbol of protection and religious beliefs. Greek people often wear a blue necklace hoping to protect   小题4:  against evils（灾祸）.

People’s    小题5:(choose) of colors is also influenced by their bodies’ reactions toward them. Green is said to be   小题6:  most restful color. It has the ability to reduce pain and relax people both mentally    小题7:  physically. People    小题8: (work) in green environment have been found to have fewer stomach aches.

Red can cause a person’s blood pressure to rise and increase people’s appetites（食欲）. Many decorators will include different shades of red in the restaurant. And many commercial websites will have a red “Buy Now” button because red is a color that    小题9: (easy) catches a person’s eye.

Blue is another calming color. Unlike red, blue is believed to cause people to lose appetite. So   小题10: you want to eat less, some suggest that eating from blue plates can help.
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单项选择题

正确的生物结构的层次是（）

A.原子、分子、细胞器、细胞、组织、器官、器官系统、生物体、生态系统

B.原子、分子、细胞器、细胞、组织、器官系统、器官、生物体、生态系统

C.原子、分子、细胞、细胞器、器官、组织、器官系统、生物体、生态系统

D.原子、分子、细胞器、组织、细胞、器官、器官系统、生物体、生态系统
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