شرکت در آزمون آنلاین زبان انگلیسی 2 - زبان انگلیسی 2 | آزمون شماره 6113

It’s necessary for the group to meet at least once a month to … their ideas over different issues.

Which of the following do you think is NOT mentioned in the passage?

In the U.S., tornadoes are responsible for 80 deaths and more than 1,500 injuries each year. Although they occur quite frequently, tornadoes are difficult to predict. Why? Tornadoes develop from storms, but only some storms have the potential to become tornadoes. Meteorologists don’t know where and when a storm will touch the ground and turn into a tornado. Today, the warning time for a tornado is usually just 13 minutes.

     Tim Samaras is a storm chaser. His job is to find tornadoes and follow them. When he gets close to a tornado, he puts a special tool called a turtle probe on the ground. This tool measures things like a twister’s temperature, humidity and wind speed. With this information, Samaras can learn what causes tornadoes to develop. If meteorologists understand this, they can warn people about twisters sooner and save lives.

     Every May and June, Samaras drives about 40,000 kilometers across an area known as Tornado Alley, looking and hoping to spot a twister. Once Samaras sees a tornado, the chase begins. But a tornado is hard to follow. Some tornadoes change direction several times__for example, moving east and then west and then east again. When Samaras finally gets near a tornado, he puts the turtle probe on the ground. The work is risky, even for a skilled chaser like Samaras. But danger won’t stop his hunt for the perfect storm.

The passage is primarily focused on … .