填空题 When home is approximately 2,000 feet under the surface of the sea, it is challenging to have your photograph taken. In Japan, however, a species of shark that is almost never seen because of its deep natural habitat came close enough to the top to grab the attention of some fishermen. This five-foot long, eel-shaped shark was caught and soon identified as a female frill shark, a primitive species that has gone through little alteration since prehistoric times. Cameras captured it while it was still swimming so that scientists could learn as much as possible from this single specimen of a mysterious species.

单选题 Which of the following is implied about scientific documentation of frill sharks?

A、 Frill sharks are rarely studied because their habitats are inaccessible to most scientific equipment.
B、 Female frill sharks are easier to study than males.
C、 Photographic evidence is the best form of documentation for marine biologists.

【正确答案】 A

【答案解析】According to the passage, the frill shark is almost never seen because of its deep natural habitat, where photographic documentation is difficult to achieve. These facts support choice A.

单选题 Which of the following best describes the central issue with which the passage is concerned?

A、 presenting evidence of a marine animal rarely witnessed in nature
B、 arguing that ancient creatures still exist in a modern world
C、 celebrating Japan's tradition of aquaculture
D、 proving that commercial fishing boats are trawling too deeply in open water
E、 documenting the extinction of prehistoric fish

【正确答案】 A

【答案解析】Choice A matches the tone of the passage while covering the main topic, the relatively unknown frill shark.