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My uncle Alex is a famous scientist. He likes to make lots of predictions about the future. He says that in 100 years, some things will be better than now. For example, people will not have to wash the dishes or sweep the floor because there will be robots in our homes. We’ll have more free time, and traveling will be faster and cheaper than it is now. Maybe some people will spend their vacations in space stations.
However, Uncle Alex says that some things will get worse in the next century. If more people use cars, there will be more pollution. If there are fewer trees, the air will become dirtier. If pollution gets really bad, maybe people will have to go and live in other planets. Uncle Alex says we’ll be very sorry if pollution becomes worse. Therefore, we should protect the environment from now on.

1.What does Alex do?

A He is a scientist.

B He is a teacher.

C He is an engineer.

D He is a cook.

解析：选A。细节理解题。根据第一段第一句My uncle Alex is a famous scientist.可知艾利克斯是一位科学家，故选A。

2.People in the future don’t need to wash dishes because ________.

A robots will do it in the future

B dishes can be eaten in the future

C people will be dirtier in the future

D people don’t need to eat in the future

解析：选A。细节理解题。根据第一段第四句For example, people will not have to wash the dishes or sweep the floor because there will be robots in our homes.可知人们不用洗碗或是扫地，因为家里都会有机器人，故选A。

3.What will happen if more people use cars?

A Cars will be cheaper.

B Cars will be more expensive.

C There will be more pollution.

D The environment will be better.

解析：选C。细节理解题。根据第二段第二句If more people use cars, there will be more pollution.可知如果更多的人使用汽车，就会有更多的污染，故选C。

4.If there are fewer trees, what will happen?

A Birds will be fewer.

B Woods will be expensive.

C The air will become fresh.

D The air will become dirtier.

解析：选D。细节理解题。根据第二段第三句If there are fewer trees, the air will become dirtier.可知如果树木少了，空气就会变得更脏，故选D。