What an evil question. To pick the correct answer we had to infer that the detection of medium and large tornadoes staying constant since 1950s means that the small ones are being detected better which means that maybe number of tornadoes have not increased.

The structure is still a bit unclear. The conclusion in the first video is the last sentence and in the second video its the second sentence

For answer choice D even if there was no "only if" present isnt it going the opposite direction? Its supposed to say = be threatened when people of that culture acquire the latest technical skills

Thank you for the video and clear explanations. I have a question about where some of core skills for these question type are located. Specifically for question 3 there were instances were the wrong answers were efficiently eliminated. I have finished the core curriculum but i still do not feel comfortable with these inferences.

What is your advice?

Thank you for the comprehensive explanations

very good and precise explanation