Which of the following are NOT mentioned in the passage as objects that are imitated as a means of protection?

Which of the following is NOT a result of the formation of ocean ice?

In line 12, the pronoun "it" refers to which of the following?

The word “bore” in line 3 is closest in meaning to which of the following?

In line 7, when the author states that the owners "anxiously watch the sky" there is the implication that the owners

Which of the following statements about the salinity of a body of water can best be inferred from the passage?

The author states that icebergs are rarely seen because they are

In lines 1, the word “enemies” refers to

In the author's opinion, the importance of coal-generated electricity could increase in the future for which of the following reasons?

According to the passage, icebergs are dangerous because they

Which of the following best describes the organization of the passage?

According to the passage, what happens to homing pigeons when they are about a month old?

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

What is the author's main purpose in the passage?

In line 6, the word “further” is closest in meaning to which of the following?

According to the passage, the ocean generally has more salt in