[填空题]Questions 14-17
Complete the following sentences with NO MORE THAN THREE WORDS.

The shaping island, Surtsey, caused by______has been witnessed by Olafsson when he was a teenager.

[填空题]Questions 14-17
Complete the following sentences with NO MORE THAN THREE WORDS.

______has been protected through the restriction of human activities on Surtsey.

[单项选择]

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.
These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Hip dysplasia is more common among German shepherds than dogs of other breeds.（）
A. than
B. than is so of
C. compared to
D. in comparison with
E. than among