题目列表(包括答案和解析)
选词填空
put down写下来,镇压 put into practice执行,实行 put off延期
put on穿上,戴上 put out扑灭,出版 put through接通电话
put up举起,安装,盖起,张贴,挂 put up for the night住宿
put up with忍受 put to death处死 put into译成…
(1)Try your best to ________ what the teacher said in class.
(2)The sports meet was ________ because of rain.
(3)A new magazine was ________ last year.
(4)It’s cold outside, ________ your overcoat.
(5)I’m afraid we will have to ________ the loss.
(6)We’ll have a telephone ________ in our office.
(7)Let’s ________ a shed here for the time being.
(8)The murderer was ________ at last.
(9)Can you ________ these sentences ________ English?
(10)A big fire broke out last night and soon it was ________.
(11)How are you going to ________ the plan ________?
(12)Then he ________ a call to Mr.Smith.
(13)We must find a place where we can ________.
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Destructive insects in larger numbers are finding Alaska forests to be a comfortable home and climate change could be the wel-come mat.
Warmer winters kill fewer insects. Lon-ger, warmer summers let insects complete a life cycle and reproduce in one year instead of two. Warm winters also can damage trees and make them less able to stop insect attacks by changing the nature of snow. Instead of light snow formed at extremely cold tempera-tures, warm winters produce wet, heavy snow more likely to break the tops of spruce trees because they are not well adapted to handling big, heavy, wet snow loads.
Since 1980, spruce bark (树皮) beetles have killed mature white spruce trees on 4. 4 million acres. For lack of two cold winters on end, the numbers of the beetles there blew up while the resistance (抵抗力) of the trees was down at the same time everywhere. Most of the mature trees have been killed in some whole region of the state.
Spruce bark beetles bore into (蛀穿)trunks and feed on the live cambium layer, a thin part of tissue between bark and wood. Trees re-sist beetles with pitch, made up of hydrocarbons including up to 17 forms of terpene (松稀). The rates of those terpenes are a signal of the health of the tree. When a tree is injured, terpene rates go off in one direction.
Using complex chemical receptors (感受 器), spruce bark beetles discover differences in terpenes. Injured trees offer less resistance.
They smell the tree. If the tree's healthy,they try to avoid it Why? If they start to bore into a healthy tree, it's got a lot of pitch, and the pitch is under high pressure. It's boring in and the pitch is pushing it back out.
(1) What would be the best title for the text?
[ ]
A.The Destruction of Forests in Alaska
B.Warm Winters and Its Bad Effects
C.The Way of Spruce Trees' Living in Alaska
D.Destructive Insects on Rise in Alaska
(2) According to the text, how do warm win-ters reduce the trees' ability to resist in-sect attacks?
[ ]
A.By changing the nature of snow.
B.By offering too much water to trees.
C.By making the weather drier.
D.By increasing the insects' growth speed.
(3) The third paragraph mainly tells________.
[ ]
A.winters are warmer and warmer
B.there are more and more beetles
C.the situation of trees is much worse
D.mature trees are easy to be attacked
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