ost is
many times the carbon dioxide intake. Actually, because of wind and other factors, the loss of
water In proportion to carbon dioxide intake may be even greater than the relative concentrations
of the two gases. Also, not all of the carbon dioxide that enters the leaf is synthesized into carbo-
hydrates ( 碳水化合物) .
共3页: 1 [2] [3] 
41 . A growing plant needs water for all of the following except__.
A. forming sugars B. sustaining woody stems
C. keeping green D. producing carbon dioxide
42 . The essential function of photosynthesis in terms of plant needs is__.
A. to form sugars B. to derive energy from light
C. to preserve water D. to combine carbon dioxide with water
43 . The second paragraph uses facts to develop the essential idea that__.
A. a plant efficiently utilizes most 0f the water it absorbs
B. carbon dioxide is the essential substance needed for plant development
C. a plant needs more water than is found in its composition
D. the stronger the wind, the more the water vapor loss
44 . According to the passage, which of the following statements is TRUE?
A. The mineral eLements will not be absorbed by the plant unless they are dissolved in its
root .
B. The woody stems contain more water than the leaves.
C. Air existing around the leaf is found to be saturated.
D. Only part of the carbon dioxide in the plants is synthesized.
45 . This passage is mainly about__.
A. the functions of carbon dioxide and water
B. the role of water in a growing plant
C. the process of simple sugar formation
D. the synthesis of water with carbon dioxide
Ⅲ . For each numbered blank in the following passage there are four choices labelled A, B, C
and D. Choose the best one and put your chnice in the ANSWER SHEET. (15 point)
When television first began to expand, very few of the people who had become famous as ra-
dio commentators were able to be equally effective on television. Some of the difficulties they ex-
perienced when they were trying to _46___ themselves to the new medium were technical. When
working _47_ radio, for example, they had become _48____ to seeing on behalf of the listener.
This _49_ of seeing for others means that the commentator has to be very good at talking. _50_
all, he has to be able to _51____ a continuous sequence of visual images which _52_ meaning
-to the sounds which the listener hears. In the _53_ of television,however,the commentator
sees everything with the viewer. His role, therefore, is _54_____ different. He is there to make _
55_ that the viewer does not miss some point of interest, to help him _56_ on particular
-things, and to _57____ the images on the television screen._58_ his radio colleague,he must
know the _59_ of silence and how to use it at tho
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