如果商品的价格上升一个不大的百分比而引起对该商品的需求量大幅度的下降，则（）A.该商

量变和质变的区别在于                                        

①量变是同一质态范围内的变化，质变是由一种质态向另一种质态的飞跃

②量变表现为微小的、不显著的变化，质变表现为显著的变化

③量变是数量的增加，质变是场所的变更和事物结构的不同

④量变表现为统一体平衡、静止状态，质变表现为统一体的分解、平衡、静止状态的破坏

A．①②③

B．①②④

C．②③④

D．①③④

患儿，女，7岁，平素易疲倦，无发绀。体检：生长发育稍差，胸骨左缘第2肋间可闻及Ⅲ级收缩期杂音，肺动脉瓣区第二心音分裂。心脏前后位X线摄片示右心室增大。心电图示右心室肥厚伴劳损。最可能的诊断是（）

A.房间隔缺损

B.室间隔缺损

C.动脉导管未闭

D.法洛四联症

E.肺动脉瓣狭窄

Butterflies are some of the most fascinating and beautiful insects in the world. Adult butterflies will live about 2 to 4 weeks. They use their senses of sight, touch, hearing, smell, and taste to survive in the world, find food and mates, lay eggs in an appropriate place, migrate, and avoid hungry enemies.

Butterflies have large compound eyes, which allow them to see in all directions without turning their heads. Like most insects, butterflies are very near­sighted, so they are more attracted to a sea of flowers than individual plants. Butterflies do not “see” colors such as red, green, and yellow, but they can sense sunlight, which indicates the direction the sun is shining, as well as ultraviolet light, which is present on many flowers and guides butterflies to honey sources.

Butterflies have a very well-developed sense of smell, but it is not in their nose, since they don't have one. Sense receptors are located in their antennae, feet, and many other parts of the body. They can help butterflies find their favorite flower honey food, and mates.

Butterflies' feet have sense organs that can taste the sugar in flower honey, letting the butterflies know if something is good to eat or not. Some females also carefully choose host plants by tasting to find appropriate places to lay their eggs. Adult butterflies feed their babies using a long tube. Butterflies force blood into the tube to straighten it out, allowing them to feed. Butterflies get all their food from this tube.

Butterflies don't have ears. Instead they “hear” sounds through their wings by sensing changes in sound vibrations.

Butterflies may possess senses we don't even know about yet, because their body structure is very different from ours, and therefore difficult to understand, when observed through our own human senses.

小题1:The text mainly focuses on ________.

A．butterflies' living habits

B．butterflies' beauty

C．butterflies' senses

D．butterflies' daily activities小题2:What can we learn from the 2nd paragraph?

A．Butterflies can see in all directions and don't need to turn heads.

B．Butterflies have good eyesight.

C．Butterflies are sensitive to bright colors including red and yellow.

D．Butterflies cannot sense the ultraviolet light.小题3:Why do female adult butterflies carefully choose the host plants?

A．To find high­qualified honey.

B．To have a good place for living.

C．To make it easier for them to hide from the enemies.

D．To find a proper place for their eggs.

下列可以用于亚硝酸盐中毒急救处理的方法有( )。

A．催吐

B．使用特效药二硫基丙醇治疗

C．应用美蓝、维生素C和葡萄糖三种合用解毒

D．洗胃

E．导泻

计算机的硬件由（）

A.CPU

B.存贮器

C.输入和输出装置

D.操作系统