High-Q | 7 סימולציה

31

סימולציה מס' 7

– אנגלית פרק שני

Text II (Questions 18-22)

Summers would seem too easy without the bothersome bumps brought on by biting and stinging bugs. Although some species of mosquito act as carriers for diseases, in developed nations they are mostly just an annoyance - mainly to mammals. However, these insects play an important role in the health of the ecosystems they inhabit. In their juvenile form, as aquatic larvae, they are an important source of food for fish. As adults, mosquitoes 5 are vital food for dragonflies, and are a favorite meal for birds and bats as well. Mosquito wings beat six hundred times a second, generating that familiar high-pitched whine. At night, only the female goes in search of a blood meal, which she needs to produce her eggs. First she looks for large dark objects that move. Should she notice that the object is giving off heat and carbon dioxide as all mammals do, she’ll stay to feed. 10 The American and black horseflies are numerous during the summer months. Together, these large biting flies inhabit every possible ecological niche in North America, from open grassland to saltwater marsh, sparing only parts of Southern California. The females inflict a painful bite as they quickly slice the skin of their victims with blade-like mouth parts, and then feed on the blood. Because their saliva contains an anti-coagulant, the wound can 15 bleed for several minutes. Don’t worry about looking for these biting bugs; they’ll be sure to come hunting for you. Zoos will be plagued with bugs throughout the summer, often including cockroaches. These tough little household scavengers, it has been said, would survive a nuclear war. Recent research has shown that they indeed are much more resistant to harmful radiation 20 than most other living things.

Questions

18. The main subject of the passage above is -

(1) the feeding habits of mosquitoes (2) how mosquitoes spread diseases among mammals (3) the ecological significance of American and black horseflies (4) insect pests of summertime

19. According to the passage, mosquitoes are ecologically important because -

(1) they breed quickly (2) they provide food for other animals

(3) they feed upon the blood of large mammals (4) their wings beat six hundred times per second

© High Q Global

© כל הזכויות שמורות לחברת High Q אין להעתיק או להפיץ בחינה זו או קטעים ממנה, בכל צורה ובכל אמצעי, כולה או חלקים ממנה, בלא אישור בכתב מחברת High Q .

Made with FlippingBook Learn more on our blog