It takes around two working days to unload the containers.（)

ntly unrelated facts. Color as seen is a mobile changeable thing depending to a large extent on the relationship of the color to other colores seen simultaneously. It is not fixed in its relation to the direct stimulus which creates it. On the other hand, the properties of surfaces that give rise to color do not seem to change greatly under a wide variety of illumination colors, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to the due in large part to the mechanism of color adaptation mentioned earlier.

When the eye is fixed on a colored area, there is an immediate readjustment of the sensitivity of the eye to color in and around the area viewed. This readjustment does not immediately affect the color seen but usually does affect the next area to which the gaze is shifted. The longer the time of viewing, the higher the intensity, and the larger the area, the greater the effect will be in terms of its persistence in the succeeding viewing situation. As indicated by the work of Wright and Schouten, it appears that, at least for a first approximation, full adaptation takes place over a very brief time if the adapting source is moderately bright and the eye has been in relative darkness just previously. As the stimulus is allowed to act, however, the effect, becomes more persistent in the sense that it takes the eye longer to regain its sensitivity to lower intensities. The net result is that, if the eye is so exposed and then the gaze is transferred to an area of lower intensity, the loss of sensitivity produced by the first area will still be present and appear as an "afterimage" super imposed on the second. The effect not only is present over the actual area causing the "local adaptation" but also spreads with decreasing strength to adjoining areas of the eye to produce "lateral adaptation". Also, because of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightnesses or have similar colors, the adaptation will tend to become uniform. over the whole eye.

This selection is concerned primarily with ______.

A．the eye's adaptation to color

B．the properties of colored surfaces

C．the effect of changes in color intensity

D．experiments on colored objects

A．The earth spins and travels around the sun at the same time

B．One day is the time it takes the earth to travel around the sun once

C．One year is the time it takes the earth to spin around once

D．It is impossible to measure the earth’s movement．

A.A.takes

B.B.takes it

C.C.it takes

D.D.he take

A、It takes a long time to reach LA.

B、Usually it takes around 12 days.

C、LA is very far from here.

ures, it's the males that give birth to the young.

Male sea horses have a fold of skin on their bellies that forms pocket, called a brood pouch. During the breeding season, the sea horse's pouch swells to receive eggs. A female sea horse lays up to 200 eggs at a time in the pouch. Then she swims off, leaving her male partner to care for the developing eggs and give birth to young sea horses. The female will return everyday to check on her mate and the eggs, but she doesn't stay long, nor does she take part in the birth.

It takes from two to six weeks for the eggs in the male's pouch to develop. During this time the male avoids open water and hides in sea grass. His big pouch makes it difficult for him to swim, so the male often uses his tail to grasp a piece of sea grass. Firmly gripping the grass, he will stay perfectly still for hours or even days. The male sea horse will change his color to blend with his surroundings and avoid being seen by predators who will try to eat him or poke holes in his pouch to get the eggs.

The eggs hatch inside the male's pouch. When the babies begin moving around, the male sea horse knows it's time for them to be born. He grabs a sea grass stem with his tail and begins rocking, bending, and stretching his body so that the rest of the babies can be born. Sometimes he has to press his pouch against a rock Or some stiff seaweed to force the young out.

Sea horse babies are born in groups of five or more. Sometimes it takes two days for the father sea horse to give birth to all his young. He is very tired when it's over.

Soon after giving birth to one brood, the male will approach his mate and show her his empty pouch. This tells her he is ready to receive eggs again.

What part does the female sea horse play in having babies？

A．Receiving eggs.

B．Laying eggs.

C．Hatching eggs.

D．Protecting eggs.

A.take

B.takes

C.took

D.taking

A.spends

B.takes

C.costs

It takes two weeks for Smith's left hand to get entirely ().

A. cured

B. dedicated

C. healed

D. mended

A.insisted

B.insist

C.insists