问题
单项选择题
以下符合小儿生长发育顺序的规律的是
A．由高级到低级
B．各系统发育快慢均衡
C．生长发育年龄阶段速度均衡
D．先慢后快
E．由简单到复杂
答案
参考答案：E
解析：小儿生长发育一般遵循由上到下，由近至远，由粗到细、由低级到高级，由简单到复杂的顺序或规律。
搜题请搜索小程序“爱下问搜题”
以下符合小儿生长发育顺序的规律的是
A．由高级到低级
B．各系统发育快慢均衡
C．生长发育年龄阶段速度均衡
D．先慢后快
E．由简单到复杂
参考答案：E
解析：小儿生长发育一般遵循由上到下，由近至远，由粗到细、由低级到高级，由简单到复杂的顺序或规律。
| The sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The sun has existed in its present state for about 4 billion, 600 million years and is thousands of times larger than the Earth. By studying other stars, astronomers can predict what the rest of the sun’s life will be like. About 5 billion years from now, the core of the sun will shrink and become hotter. The surface temperature will fail. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the sun will expand approximately 35 million miles, about the distance to mercury, which is the closest planet to the sun. The sun will then be a red giant star. Temperatures on the earth will become too hot for life to exist. Once the sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the earth, it will become a white dwarf star. The sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf. After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the earth will be dark and cold. If any atmosphere remains there, it will have frozen onto the earth’s surface. |
The phrase "throw off" underlined in Paragraph 3 most probably means ______ .
A．eject
B．burn up
C．convert
D．let in