多选题 Water beetles have a number of adaptations that make them able to live in water rather than on land as their countless beetle cousins do. Their spiracles open and close to take in air when they are on the surface and keep water out when they are underwater. Whirligig beetles have a clever division in their eyes that allows them to see above and below the surface at the same time. A number of water beetles, especially those that dive to find prey, trap and carry air bubbles with them on their abdomens, much as scuba divers carry air in their oxygen tanks. The legs of water beetles differ from those of their landlubber cousins. Often they are covered with fringelike hairs that help them speed across the water"s surface. Like all beetles, water beetles are capable of flight, but they usually use this skill only to escape predators or to move from puddle to pond.

单选题 The sentence in the passage that connects LEAST to the main idea is probably

A、 the sentence about spiracles that open and close
B、 the sentence about seeing above and below the surface
C、 the sentence about trapping and carrying air bubbles
D、 the sentence about fringelike hairs
E、 the sentence about water-beetle flight

【正确答案】 E

【答案解析】First find the main idea. The passage as a whole deals with adaptations that allow water beetles to live in water. Choices A, B, C, and D support this main idea, but choice E does not.

单选题 It can be inferred that the author mentions scuba divers primarily to

A、 argue that members of the animal world have a good deal in common
B、 give the reader a clear visual reference that will help clarify a point
C、 contrast a natural means of diving with an artificial mode of diving
D、 explain how scientists have analyzed the water beetle"s motility
E、 provide a humorous aside in an otherwise serious study

【正确答案】 B

【答案解析】Look back at the sentence about scuba divers. The author is giving you a comparison that helps you better imagine how the water beetle carries air. The best answer is choice B.