2020年托福阅读模拟试题及答案(卷七)

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托福阅读文本：

Aviculturists, people who raise birds for commercial sale, have not yet learned how to simulate the natural incubation of parrot eggs in the wild. They continue to look for better ways to increase egg production and to improve chick survival rates.

When parrots incubate their eggs in the wild, the temperature and humidity of the nest are controlled naturally. Heat is transferred from the bird's skin to the top portion of the eggshell, leaving the sides and bottom of the egg at a cooler temperature. This temperature gradient may be vital to successful hatching. Nest construction can contribute to this temperature gradient. Nests of loosely arranged sticks, rocks, or dirt are cooler in temperature at the bottom where the egg contacts the nesting material. Such nests also act as humidity regulators by allowing rain to drain into the bottom sections of the nest so that the eggs are not in direct contact with the water. As the water that collects in the bottom of the nest evaporates, the water vapor rises and is heated by the incubating bird, which adds significant humidity to the incubation environment.

In artificial incubation programs, aviculturists remove eggs from the nests of parrots and incubate them under laboratory conditions. Most commercial incubators heat the eggs fairly evenly from top to bottom,

thus ignoring the bird's method of natural incubation, and perhaps reducing the viability and survivability of the hatching chicks. When incubators are not used, aviculturists sometimes suspend wooden boxes outdoors to use as nests in which to place eggs. In areas where weather can become cold after eggs are laid, it is very important to maintain a deep foundation of nesting material to act as insulator against the cold bottom of the box. If eggs rest against the wooden bottom in extremely cold weather conditions, they can become chilled to a point where the embryo can no longer survive. Similarly, these boxes should be protected from direct sunlight to avoid high temperatures that are also fatal to the growing embryo. Nesting material should be added in sufficient amounts to avoid both extreme temperature situations mentioned above and assure that the eggs have a soft, secure place to rest.

托福阅读题目：

1. What is the main idea of the passage ?

(A) Nesting material varies according to the parrots' environment.

(B) Humidity is an important factor in incubating parrots' eggs.

(C)Aviculturists have constructed the ideal nest box for parrots.

(D) Wild parrots' nests provide information useful for artificial incubation.

2. The word "They" in line 2 refers to

(A) aviculturists

(B) birds

(C) eggs

(D) rates

3. According to paragraph 2, when the temperature of the sides and bottom of the egg are cooler than the top, then

(A) there may be a good chance for successful incubation

(B) the embryo will not develop normally

(C) the incubating parent moves the egg to a new position.

(D) the incubation process is slowed down

4.According to paragraph 2, sticks, rocks, or dirt are used to

(A) soften the bottom of the nest for the newly hatched chick

(B) hold the nest together

(C) help lower the temperature at the bottom of the nest

(D) make the nest bigger

5.According to paragraph 2, the construction of the nest allows water to

(A) provide a beneficial source of humidity in the nest

(B) loosen the materials at the bottom of the nest

(C) keep the nest in a clean condition

(D) touch the bottom of the eggs

6.All of the following are part of a parrot's incubation method EXCEPT

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