Adult butterflies use their senses of sight, touch, hearing, smell, and taste to

Adultbutterflies use their senses of sight, touch, hearing, smell, and taste tosurvive in the world, find food and mates, lay eggs in an appropriate place,migrate, and avoid hungry predators.

Sight

Butterflieshave large, compound (multifaceted) eyes, which allow them to see in alldirections without turning their heads. Like most insects, butterflies are verynearsighted, so they are more attracted to a large stand of flowers rather thanindividual plants. Butterflies do not "see" colors such as red,green, and yellow, but sense polarized（偏振的） light, which indicates the direction thesun is shining, as well as ultraviolet light, which is present on many flowersand guides butterflies to nectar （花蜜）sources.

Smell

Butterflieshave a very well-developed sense of smell, but it's not in their nose (sincethey don't have one). Sense receptors located in their antennae, feet, and manyother parts of the body help butterflies find food (usually flower nectar), andmates (the female smells the male's pheromones).

Taste

Butterfly'sfeet have sense organs that can taste the sugar in nectar, letting thebutterfly know if something is good to eat or not. Some females also taste hostplants in order to find appropriate places to lay their eggs. Adult butterfliesand moths feed using a proboscis, a long, coiled tube. Butterflies force bloodinto the tube to straighten it out, allowing them to feed. Butterflies get alltheir food from this tube.

Hearing

Butterfliesdon't have ears. Instead they "hear" sounds through their wings bysensing changes in sound vibrations.

Butterfliesmay possess senses we don't even know about yet because their anatomy is verydifferent than ours, and therefore difficult to understand when perceivedthrough our own human senses.

1.From the passage we can know that butterflies can see_____

  A. thing behindthem              B. thing in the distance

  C. most brightcolors              D. flower nectar from a distance

2. Butterflies can easily find food resources by usingtheir______.

A.sense organs of sight and smell     B. sense organs ofsight and taste

C.sense organs of smell and hearing   D. sense organs of smell andtaste

3. How do butterflies feed themselves?

  A. by using theirfeet               B. by using a tube.

  C. by using sensereceptors           D. byusing their wings.

4.What is the passage mainly about?

  A. The food sources ofbutterflies.     B. The habits of butterflies.

  C. The unusual body ofbutterflies.     D. the sense of butterflies.

试题答案

【答案】

1.A2.A3.B4.D

【解析】略