The underlined word in "Nearly 2 million sponsors are linked with children" (l.04) has the same meaning as:

The noun form which corresponds to long in "long term improvement" (l.09) is:

According to the text, the air in São Paulo is:

It can be deduced from text I that the laser

struck scientists as a future powerful tool.

It can be deduced from text I that the laser

was not expected to have such a wide variety of uses.

It can be deduced from text I that the laser

can have a broad variety of models.

It can be deduced from text I that the laser

is usually cheap.

It can be deduced from text I that the laser

weapons tested by the military can be as huge as buildings.

From text I, it can be concluded that

lasers can be used for pacific or warring purposes.

From text I, it can be concluded that

it is often possible for ordinary tools to replace the uses of the lasers.