[单项选择]Racing the clock every day is such an exhausting effort that when I actually have a few free moments, I tend to collapse.
A. fall down
B. fall ill
C. fall out
D. fall behind

[单项选择]The shop is opened at eight o'clock every day.（　）
A. The
B. is opened
C. at
D. o'clock

[单项选择]A Special Clock Every living thing has what scientists call a biological clock that controls behavior. The biological clock________(51) plants when to form flowers and when the flowers should open. It tells insects when to __________(52) the protective cocoon (防护卵袋) and fly away, and it tells animals and human beings when to eat, sleep and wake. Events outside the plant and animal__________(53) the actions of some biological clocks . Scientists recently found, for example, that a tiny animal changes the color of its fur because of the __________(54) of hours of daylight. In the short_________(55) of winter, its fur becomes white. The fur becomes gray brown in _________(56) in the longer hours of daylight in summer. Inner signals control other _________(57) clocks. German scientists found that some kind of internal clock seems to order birds to begin their long migration_________(58) twice each year. Birds _________(59) from flying become restless when it is time for the
A. says
B. asks
C. talks
D. tells

[单项选择]"Every day, every hour, brought to him one more, little stroke of her nature, and to her one more of his, " the sentence is found in ______.

[单项选择]Mrs. White was free every day.

[单项选择]How many children die every day from malnutrition and preventable diseases according to the UN estimation


A. Twenty-five thousand.
B. Fifty-five thousand.
C. Forty-five thousand.
D. Thirty-five thousan