When we are young, we learn that
tigers and sharks are dangerous animals. We might be scared of them because
they are big and powerful. As we get older, however, we learn that sometimes
the most dangerous animals are also the smallest animals. In fact, the animal
that kills the most people every year is one that you have probably killed
yourself many times: the mosquito.
While it may seem that all
mosquitoes are biters, this is not actually the case. Male mosquitoes eat plant
nectar. One the other hand, female mosquitoes feed on animal blood. They need
this blood to live and produce eggs. When a female mosquito bites a human
being, it transmits a small amount of saliva into the blood. The saliva may or
may not contain a deadly disease. The result of the bite can be as minor as an
itchy bump or as serious as death.
Because a mosquito can bite many
people in the course of its life, it can carry diseases from one person to
another very easily. Two of the most deadly diseases carried by mosquitoes are
malaria and yellow fever. More than 700 million people become sick from these
diseases every year. At least 2 million of these people will die from these
diseases.
Many scientists are working on
safer and better ways to kill mosquitoes, but so far, there is no sure way to
protect everyone in the world from their deadly bites. Mosquito nests can be
placed over beds to protect people against being bitten. These nets help people
stay safe at night, but they do not kill any mosquitoes. Mosquitoes have many
natural enemies like bats, birds, dragonflies, and certain kinds of fish.
Bringing more of these animals into places where mosquitoes live might help to
cut down the amount of mosquitoes in that area. This is a natural solution, but
is does not always work very well. Mosquitoes can also be killed with poisons
or sprays. Even though these sprays kill mosquitoes, they may also harm other
plants or animals.
Although mosquitoes may not seem
as scary as larger, more powerful animals, they are far more dangerous to human
beings. But things are changing. It is highly likely that one day scientists
will find a way to keep everyone safe from mosquitoes and the diseases they
carry.
Which of the following best
summarizes the information in paragraph 4?
The Baxter house is located at the
end of the street. This house sits farther back from the curb than the other
houses. It is almost difficult to see from the road without peering behind the
deformed oak tree that has obscured it for years. Even so, the Baxter house
stands out from the other houses on the street. It is tall and white. However,
this white is no longer pristinely white, but a dingy grayish cram color. Long
vines hang from the tattered roof. The Baxter house is two stories tall and has
a large yard in the back that has never been mowed. The other houses on the
street are a mere one story and have been painted a variety of colors. The
newer, single story properties all appear to have been built around the same time;
the yards mostly being of the same size, and the houses appearing to be clones
of one another. Aside from the Baxter house at the end, this street is a
perfect slice of middle America. The inhabitants of the other houses wonder who
lives in the ancient, dilapidated house at the end of the street.
Based on its use in the passage,
which of the following statements accurately describes something that has been ‘obscured’?
In the early 1920's,
settlers came to Alaska looking for gold. They traveled by boat to the coastal
towns of Seward and Knik, and from there by land into the gold fields. The
trail they used to travel inland is known today as the lditarod Trail, one of the
National Historic Trails designated by the congress of the United States. The
Iditarod Trail quickly became a major thoroughfare in Alaska, as the mail and
supplies were carried across this trail. People also used it to get from place
to place, including the priests, ministers, and judges who had to travel
between villages down this trail was via god sled. Once the gold rush ended,
many gold-seekers went back to where they had come from, and suddenly there was
much less travel on the lditarod Trail. The introduction of the airplane in the
late 1920's meant dog teams were mode of transportation, of course airplane
carrying the mail and supplies, there was less need for land travel in general.
The final blow to the use of the dog teams was the appearance of snowmoniles.
By the mid 1960's most Alasknas didn't even know the lditarod Trail existed, or
that dos teens had played a crucial role in Alaska's early settlements. Dorothy
G.Page, a self-made historian, recognized how few people knew about the former
use of sled dogs as working animals and about the Iditarod Trail's role in
Alaska's colorful history. To she came up with the idea to have a god sled race
over the Iditarod Trail. She presented her idea to an enthusiastic musher, as
dog sled drivers are known, named Joe Redington, Sr. Soon the pages and the
Redintons were working together to promote the idea of the Iditarod race. Many
people worked to make the first Iditarod Trail Sled Dog Race a reality in 1967.
The Aurora Dog Mushers Club, along with men from the Adult Camp in Sutton,
helped clear years of overgrowth from the first nine miles of the Iditarod
Trail. To raise interest in the race, a $25,000 purse was offered, with Joe
Redington donating one acre of his land to help raise the funds. The short race,
approximately 27 miles long, was put on a second time in 1969. After these
first two successful races, the goal was to lengthen the race a little further
to the ghost town of Iditarod by 1973. However in 1972, the U.S. Army reopened
the trail as a winter exercise, and so in 1973, the decision was made to take
the race all the way to the city of Nome-over 1,000 miles. There were who
believed it could bot be done and that it wad crazy to send a bunch out into
vast, uninhabited Alaskan wilderness. But the race went! 22 mushers finished
that year, and to date over 400 people have completed it.
Based on information in
the passage, it can be inferred that all of the following contributed to the
disuse of the Iditarod Trail except
