更多"Living in the central Australian de"的相关试题:
[单项选择]Living in the central Australian desert has its problems, ______ obtaining water is not the least.
A. of which
B. for what
C. as
D. whose
[单项选择]Living in the central American desert has its problems, ( ) obtaining water is not the least.
A. of which
B. for what
C. as
D. whose
[单项选择]Living in the desert of Africa has its problems;()obtaining fresh water is not the least.
A. with which.
B. for which
C. of which
D. which
[单项选择](Survival) in the desert has always (depended in) the (availability) of (water).
A. Survival
B. depended
C. availability
D. water
[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. time
B. value
C. amount
D. number