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10."8"字环:是最常见、最常用的下降保护，此类器械形如“8”字，结构简单.

A. 对
B. 错

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11.初学滑雪的人，应该选长度短一些，弹性大一些的滑雪板

A. 对
B. 错

Filling the blanks with the words given below.enlightening discarded restore fluctuating prejudiced profitrival motivating implement investigate

Filling the blanks with the words given below.enlightening discarded restore fluctuating prejudiced profit rival motivating implement investigate3.Although personally we believe this to be of only secondary importance, its potential role in _ innovative acts cannot be ignored.4. Though many things have been changed culturally, there is a commitment and sense of responsibility that have not yet been discarded in today’s society.5.Western nations have older and shrinking populations since they entered the 21st century and their birth rates have also posed problems.6.She didn’t want to marry him and was _ against him because he had only a bachelor’s degree and didn’t meet her expectations for marriage.

Filling the blanks with the words given below.enlightening discarded restore fluctuating prejudiced profit rival motivating implement investigate7. The president is in trouble and will have to work hard to _______ his credibility after people discovered that he was not telling the truth.8.To study a number of subjects in the humanities has been both enjoyable and different perspective on the world in which we live.9.People are concerned about the environment issue because air and water pollution not only affects everyone’s health but also makes it difficult for business to _.10. Instead of ignoring or envying successful students, I made it my mission to ___ the mysterious causes of their success and greatness.