更多"Although we are not sure why we sle"的相关试题:
[单项选择]Although we are not sure why we sleep, there is no doubt ______ we need to do so.
A. whether
B. why
C. what
D. that
[单项选择]We should always make sure that we control technology rather than have it control us.
A. 我们应该确保由我们来控制技术而不是让技术控制我们。
B. 我们应该确保由我们来技术控制更愿意让技术控制我们。
C. 我们应该确保由我们来控制技术不愿意让它控制我们。
D. 我们应该确保由我们来控制技术比让技术控制我们要好。
[单项选择]We are quite sure that we can ______ our present difficulties and finish the task according to schedule.
A. get across
B. get over
C. get away
D. get off
[单项选择]We haven't the ______ idea why we got such a massive telephone bill last month.
A. dampest
B. mistiest
C. foggiest
D. rainiest
[单项选择]Let's put our heads together and I am sure that we will certainly find a (an) ______ to the problem.
A. answer
B. solution
C. key
D. way
[单项选择]Which of the following is NOT the reason why we often don't understand others according to the author
A. Our thoughts do not always concentrate on what the speaker is saying.
B. Our own ideas influence our understanding of the speaker.
C. Our interest influences our understanding of the speaker.
D. We are not good at communication with others.
[单项选择]According to the author, the reason why we go wrong about our friends is that ______.
A. we fall to listen carefully when they talk
B. people tend to be annoyed when we cheek what they say
C. people usually state one thing hut means another
D. we tend to doubt what our friends say
[单项选择]The reason why we are late is ______ our car didn't come.
A. why
B. that
C. because
D. for
[单项选择]W: I don't know why we listen to GeorgeM:______
[单项选择]A: I don't know why we listen to George B: ______
[单项选择]
Passage Five
Although no one is certain why migration occurs, there are several theories. One theory is based upon the premise that prehistoric birds of the northen Hemisphere were forced south during the Ice Age, when glaciers covered large parts of Europe, Asia, and North America. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit, and now, although the glaciers have disappeared, the habit continues.
Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics.
A more recent theory, known as photoperiodism, suggests a relationship between increasing daylight and the stimulation of certain glands in the birds’ bod
A. exact reasons for migration are not known
B. birds migrate because of changes in temperature
C. the ancestral home of all birds was the tropics
D. glaciers caused birds to migrate