nineties.

解析：考查状语从句的连词。即使我爷爷已经90多岁了，但他有时还打网球。even if即使，引导条件状语从句，含有让步的含义;as if/though仿佛，引导方式状语。

6.is believed is that before long there will be no distinct major racial or cultural groups.

解析：句意：人们认为，要不了多久，不可能存在一种主要的种族或文化群体。分析句子结构，"is that从句"是系表结构作谓语，What引导主语从句，在从句中充当主语。

7.Liu Yang is the first Chinese woman to the Tiangong 1 space module.

解析：句意：刘洋是到达"天宫一号"太空舱的第一位中国女性。the first+名词+不定式，第一个做......的......。

8.This diversity of culture is not when you know the history of California.

解析：surprised感到吃惊的，修饰人；surprising令人吃惊的，修饰事物。

9.The settlers crossed the Bering Strait by means of a land bridge which was existed in prehistoric times.

解析：exist存在，不及物动词，没有被动语态。

10.People from different parts of China,by the climate and lifestyle, move to Dali, Yunnan Province.

解析：分析句子成分，以及by可知，过去分词短语作定语，修饰people。attracted by被......吸引。

Ⅲ.阅读理解

　　（2016·四川卷） If you could have one superpower, what would it be?

　　Dreaming about whether you would want to read minds, see through walls, or have superhuman strength may sound silly, but it actually gets to the heart of what really matters in your life.

Every day in our work, we are inspired by the people we meet doing extraordinary things to improve the world.