更多"Doves flying in daylight use the su"的相关试题:
[简答题]Doves flying in daylight use the sun for guidance. But the stars are obviously their most important means of navigation. They find their way by such landmarks as mountains ranges, coastlines, and river courses. When it is too dark to see these, the doves circle helplessly, unable to get their bearings.
[简答题]Its first use was as a shade against the sun.
[单项选择]When doves are about two weeks old, they are covered with grey feathers and are ready to try their wings.
A. grow
B. wrap
C. hide
D. test
[单项选择]In total darkness, doves______.
A. use landmarks
B. don’t know which way to fly
C. fly back home
D. wait for the stars to appear
[填空题]Paragraph Three
Daylight saving time began in the United States during World War I, primarily to save fuel by reducing the need to use artificial lighting. Although some states and communities observed daylight saving time between the wars, it was not observed nationally again until World War II.
[单项选择]Daylight saving time was instituted to increase productivity.（ ）
A. reorganized
B. started
C. encouraged
D. taught
[单项选择]Daylight Saving Time begins on Monday, April 3, 2005. People in most parts of the United States will turn their clocks ahead one hour.
The official (正式的) time to turn your clock ahead is early in the morning, April 3. Two a.m. becomes three a.m. Sunday will have only 23 hours. (Most people changes their clocks before they go to sleep Saturday night.)
In the fall, people turn their clock back an hour. This saying helps people remember which way to turn the clock: "Spring ahead; fall back." (Spring and fall each have two meanings here.)
We use daylight Saving Time in order to save electricity (电) . We need one less hour of light from electricity each day in the summer.Daylight Saving Time is used in the summer.
[A] Right. [B] Wrong. [C] Doesn’t say.
