What sentence best expresses the main idea of this passage? A)
The Sears Tower in Chicago, Illinois has long since
been surpassed as the tallest building in the world.
The Taipei 101 (located in Taipei, Taiwan) is the
second tallest building in the world after the Burj
Dubai.
B)
Once it is finished, the tallest building in the world
will be called the Burj Dubai and be over 160 stories
high.
The tallest buildings in the world, known as
D) superscrapers, are built by competition architects
from different nations.

Walking is not the most exciting form of exercise a person can take on for fitness. yet it is low impact and requires no fancy equipment. that makes walking a simple activity for those new to exercise. walking is less likely than other exercises to cause injury to leg tendons and muscles. all it requires is a good pair of sneakers-no cables, stylish outfits, or weights required. of course, a person could increase the benefit of a workout by adding weights or speed walking. identify the main idea of this paragraph. walking is a difficult and safe exercise for beginners. walking is an easy and safe exercise for beginners. walking is a boring and dangerous form of exercise. walking is an exciting and very effective form of exercise.