What does the passage mainly discuss?

According to the passage, what does “slip away” mean?

In paragraph 2, the word “those” refers to ______.

Which of the followings is NOT an evidence of monitoring studying?

Which of the following is the best title for the passage?

What is the main idea of the first paragraph?

This passage is mainly about______.

What does the author imply about the United States and Canada?

What is the topic of the passage?

In the paragraph 2, the word “accomplishments” can be best replaced by ____.

he phrase “hacks for” in the title is closest in meaning to______.

The word “roughly” in paragraph 2 is closest in meaning to______.

What is the Pareto principle?

Surgeons in the early 20^th century compared with modern ones ______.

It can be inferred from the passage that if an item contains more carbon-14 than nitrogen-14, then the item is______.

The phrase “latchkey children” in the passage means children who ______