The changes possibly caused by the cell phones are mainly concerned with

The purpose of the passage is to ______

The word “elements” is most similar to ______

If you are in a foreign country, the best way the writer suggests to you is to wear .

It can be inferred from the passage that the ice would not be flat if ______

The paragraph following the passage most probably discusses

Negative publicity" in the passage most likely means .

Ten thousand years ago _____.

The word “elegant” is closest in meaning to _______.

What does the passage mainly discuss?

The man mentioned in the passage, who used his cell phone too often,

What is the main topic of the passage?

If you visit an American friend at home in the evening, you may find that your friend wears

According to the passage, cell phones are especially popular with young people because

The word "means" in the passage most closely means

Why is David different from other young people at his age?