Question

Mark Twain once said that everyone talks about the weather, but no one ever does anything about it. This was true in his day. But it may not be the cave in today’s world. In fact, humans have found many different ways to control the weather.

Cloud seeding(云催化) is a kind of technology that can control rain. It is done by spreading chemicals like dry ice or silver iodide(碘化银) inside of clouds, either by rocket or airplane. This changes water content inside the cloud, which helps to control the rainfall, the time and even the place where it rains.

This technology has helped to solve natural disasters, such as droughts(干旱). It has also played a key role during important events. For example, China used cloud seeding in Beijing just before the 2008 Olympic Games in order to stop rain from falling during the event.

Cloud seeding has been put into use for some time, however, some scientists are still wondering whether this technology is safe. On one hand, it is believed that it might have side effects(副作用). For example, silver iodide may be bad for the environment. On the other hand, no two clouds are the same, so every new experiment introduces new conditions.

In addition to controlling rain, scientists have also tried to find ways to weaken storms and hurricanes. Scientists at the US National Hurricane Centre Headquarters think it might be possible to control hurricanes by using lasers(激光). Others believe that burning rock oil in a hurricane’s path could slow the storms down.

1.The material above may be from a(an) ___________.

A.poem B.play C.advertisement D.magazine

2.What can we learn about cloud seeding?

A.Cloud seeding may not be environmentally friendly.

B.Cloud seeding can solve all the problems caused by rain.

C.Cloud seeding technology is welcomed by all the scientists.

D.Cloud seeding has been in use to control storms and hurricanes.

3.This passage is probably written to tell ___________.

A.the advantages of cloud seeding B.the importance of technology

C.the ways of controlling the weather D.the side effects of cloud seeding

Answer 1