问题 问答题 简答题

起跨攻栏的有效性取决于哪几点?

答案

参考答案:

(1)起跨攻栏时,确定好适宜个人特点的起跨点极为重要。起跨点离栏架过远,必然造成上栏困难或跨栏步过大,延长过栏腾空时间。起跨点过近,则必然加大起跨腾起角度,形成跳栏动作,同样延长了过栏腾空时间。优秀运动员的起跨点,一般距离栏架2.00—2.20米。

(2)起跨着地快,蹬地快,起跨前一步,步长应缩短15—20厘米左右。起跨腿(通常是有力腿)用前脚掌在靠近身体重心投影点附近的起跨点快速着地起跨。起跨前这一步长适当缩短,不仅有助于起跨时身体重心处于较高的位臵,减少起跨时对垂直速度的要

求,而且能使身体重心尽快地通过支撑点上方,迅速转入做攻栏动作。当身体重心通过支撑点上方转入攻栏后,起跨腿要迅速伸展髋、膝、踝三关节,同时髋部要前送,上体稍前倾,摆腿异侧臂也前伸,使身体重心有较大距离的前移,以取得适宜的起跨蹬地角。一般以65º—70º为宜。

(3)上栏攻摆快,当起跨腿着地时,摆动腿由体后屈膝向前摆动。当进入攻栏时,摆动腿大、小腿继续折叠向前上方高摆。这个摆动腿的折叠和向前上方高摆动作,由于缩短了摆动半径,加快了腿的摆动速度,从而能提高起跨攻栏的效果。

阅读理解

Spider-Man 3 (《蜘蛛侠3》)got $29.15 million on the very first day in 16 overseas markets and beat the first two Spider-Man movies.

“The movie had the best opening day ever in some countries on Tuesday, including France, Italy and South Korea.” a man from Sony Pictures said.

“Spider-Man 3 will open during the next few days in many other countries, including the United States on Friday. We certainly hope the same thing will happen in North America,” said Jeff Blake, Sony vice chairman, on Wednesday. 

2002’s Spider-Man opened with $114.8 million in its first weekend, a debut record that stood until Pirates of the Caribbean: Dead Man’s Chest broke it last year with $135.6 million a weekend.

Spider-Man 2 opened on a Wednesday before the fourth weekend of July in 2004, and set a record of $180.1 million in its first six days.

In France, Spider-Man 3 took in $6.8 million on the opening day, more than the first days for Spider-Man and Spider-Man 2 combined.

It earned $4.6 million in Germany, $4 million in Italy, $3.7 million in Japan, $3.4 million in South Korea, $1.1 million in the Philippines and $1 million each in Hong Kong and Thailand.

小题1:Spider-Man 3 ____________when it was shown on the first day.

A.was not very popular

B.was enjoyed by the people in Canada

C.earned more money than Spider-man 2

D.got $29.15 million in America小题2:Jeff Blake hopes that ________.

A.more and more people can see the movie

B.Spider-man 3 will be enjoyed by children

C.Spider-man 3 will make as much money as the first two movies

D.Spider-man 3 will be as popular in North America as it was in other places小题3:In which country did Spider-man 3 earn the most money?

A.Germany.

B.Italy.

C.South Korea.

D.America.小题4:The main idea of the passage is that ______.

A.people expect to see Spider-Man 4 soon

B.Spider-man 3 is more popular in South Korea than in Germany

C.Spider-man 3 cost lots of money

D.Spider-man 3 is very popular all over the world小题5:You would probably read this passage from ______.

A.a talk show

B.a movie magazine

C.an ad

D.a notice

单项选择题