- In deserts the days are very hot, but the nights are cold because there is little or no water in the atmosphere. Water acts as a blanket in retarding the escape of the heat of the day after
Your answer:
dawn.
sunset.
moonrise.
noon.
- Many parents have found to their dismay that, as their child's high enthusiasm for a four-footed pet subsides, the care of the animal rests largely on
Your answer:
the dog.
them.
friends.
the children.
- If I give a professional address to an audience of people who are occupied in the same line of work as I am, I can assume that they can recognize and correct the blunders that I may make. If they do not, it is their fault and not mine. But, when I appear before body of people who know nothing about the matter, who take whatever I say to be true, surely it becomes needful that I carefully consider what I say, and make sure that it is
Your answer:
debatable.
technical.
correct.
elementary.
- Bitumen is a substance formed by nature from the remains of microscopic animals and plants that lived millions of years ago. Some of its derivatives are oil and asphalt. If this transformation in nature had not taken place, many of todays's important industries would not be
Your answer:
endangered.
possible.
losing money.
costly.
- John James Audubon (1785-1851) studied and painted the birds and animals of North America. It is in tribute to Audubon that the oldest and largest conservation organization in North America is called the
Your answer:
National Audubon Society.
American Conservation Society.
Painters of Wildlife.
Bird Society of America.
- Some insects do not breathe through a nose or throat, none of them can be said to have a voice. The katydid produces its shrill noise by rubbing its wings together; the sound is not
Your answer:
audible.
melodic.
rhythmic.
vocal.
- Contrary to common belief, not all Arabs are Bedouins. The Arabs use the term Bedouin only for those who always live in tents and who do no farming, but instead are wanderers. Many Arabs live permanently in tents near their cornlands, but these persons are not true
Your answer:
Arabs.
Asiatics.
Bedouins.
Moslems.
- The snowshoe rabbit is aided in its struggle for survival by the changing hue of its fur. In summer it is camouflaged when its coat take on the grey brown of its tundra home. When winter snow flies, the rabbit is
Your answer:
safe.
asleep.
white.
warm.
- Mushrooms grow best at a temperature of about 10 degrees Celsius. Many of the mushrooms produced commercially are grown in caves. One firm built over 4000 square meters of aboveground space for cultivating mushrooms. In the summer, heat pumps bring in cool air from nearby caves, and in the winter the same pumps bring in warmer air. Thus, natural caves and underground areas still
Your answer:
provide an inexpensive crop of the delicacy.
play an important part in mushroom production.
increase the value of the crop.
are used for protection against atomic blasts.
- There is one kind of waterwheel that is ringed by buckets that catch the water at the top of the wheel as it flows from a stream through a trough or pipe. The weight of the water in the buckets moves the wheel as the water falls into each bucket in turn. As soon as a bucket reaches the bottom of the wheel, the
Your answer:
wheel turns.
stream overflows.
pipe is empty.
water spills out.