Question

【题目】 Altitude training is a way of encouraging the body to produce more red blood cells, which can improve endurance (耐力 )when performing activities at lower altitudes. This kind of training normally involves living at a high altitude and training at a lower one, because the body needs oxygen to train. 【1】 Athletes from endurance sports typically benefit from this kind of training, but its effects will be felt by anyone who has a long stay at a high altitude.

For the purposes of altitude training, an altitude of about 2, 500 meters is desirable but any relatively high altitude will work. 【2】 So it is common to use a lower altitude.

【3】 this is accomplished by using the body’s natural response to needing more oxygen over a long period of time. There are people who question whether altitude training actually works by increasing the number of red blood cells. In theory, if one is competing at sea level, the increase in red blood cells will last for several days, after leaving the high altitude, giving one a competitive edge. 【4】

While altitude training is primarily used by athletes who need increased endurance, the desired effects of high altitudes will be experienced by anyone who travels to a high altitude for a long period of time.【5】 Children who normally live at high altitudes can become very active when brought to low altitudes due to similar effects.

A. Less oxygen makes them hard to breathe.

B. Red cells have been proved to be effective

C. It’s difficult to find altitudes this high that are still fit for training

D. It can be argued that any positive effects disappear too quickly to be useful

E. However, it is more common to actually travel to high altitudes in order to train

F. The purpose of altitude training is to increase the number of red blood cells in the body

G. Many people experience a great increase in energy when returning from high altitudes

Answer 1

【答案】

【1】E

【2】C

【3】F

【4】D

【5】G

【解析】

本文是说明文。高原训练不仅能够改善运动员的耐力，同时在运动员离开高原后其影响也能够持续一段时间。

【1】根据空格前面内容“This kind of training normally involves living at a high altitude and training at a lower one”可知，这里说的是高原训练的场所。故选项E符合语境。

【2】根据空格后面内容“So it is common to use a lower altitude.”可知，上下文为因果关系。故选项C符合语境。

【3】根据空格后面内容可知，高原训练的目的是增加人体红细胞的数量。故选项F符合语境。

【4】根据空格前面内容可知，可以这样说，任何积极的影响消失得太快，以致于无法发挥作用。故选项D符合语境。

【5】根据空格前后内容可知，许多人从高海拔地区返回时会经历能量的大幅增加。故选项G符合语境。