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The world is not hungry,but it’s thirsty. 1 while we say we are short of water.Why?Because about 97% of water on the earth is sea water which we can‘t drink or use for watering plants directly.Man can only drink and use the 3% of water that comes from rivers and lakes. 2 ,because some of it has been polluted. Now more water is needed.The problem is how we can avoid a serious water shortage in the future. 3 Scientists are making study in this field.Today,In most large cities water is used only once and then runs to the sea or rivers.but it can be used again.Even if every large city reused its water,the water will still not be enough. 4 . The sea seems to give us the best answer.There is a lot of water in the sea.All that needs to be get the salt out of the sea water.This will be expensive,but it has already been used in many parts of the world. 6 So you see,if we can find out a way,we’ll be in no danger of drying up. 从方框中所给的选项中选出能填入空白处的最佳选项,补全短文。其中有一多余选项。 A.Scientists are trying to find a cheaper way of doing it. B.It seems strange that nearly 3/4 of the earth is covered with water. C.What could people do next? D.We should use all the water directly. E. First, we should find out ways to reuse it. F. And we can’t even use all of that.
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【简答题】A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Design...
【单选题】的进口段和闸门井均布置于山体中。进口段开挖成喇叭形,以使入水平顺。闸门段经渐变段与引水隧洞衔接。这种进水口适用于地质条件较好、地形坡度适中的隧洞进口。
A.
岸塔式进水口
B.
塔式进水口
C.
竖井式进水口
D.
坝式进水口
【单选题】的进口段和闸门井均布置于山体中。进口段开挖成喇叭形,以使入水平顺。闸门段经渐变段与引水隧洞衔接。这种进水口适用于地质条件较好、地形坡度适中的隧洞进口。
A.
岸塔式进水口
B.
塔式进水
C.
竖井式进水口
D.
坝式进水口
【单选题】自然大调的导七和弦是______结构。
A.
减三小七和弦
B.
减三减七和弦
C.
大三小七和弦
D.
小三小七和弦
【单选题】自然大调中,导七和弦的和弦结构是什么?
A.
大小七和弦
B.
大七和弦
C.
减小七和弦
D.
减七和弦
【单选题】— Guess what? The university has accepted my application! — Wow! That ’ s __________ new I ’ ve heard this year, Boris! Let ’ s celebrate. A. a worse B. the worst C. a better D. the best
A.
a worse
B.
the worst
C.
a better
D.
the best
【多选题】下列关于闸门竖井式进水口的叙述中正确的是:
A.
其进口段和竖井段都是直接从山体中开凿而成
B.
其可充分利用岩石的作用,钢筋混凝土工程量较少
C.
适合于隧洞进口地质条件较好,地形坡度较抖的情况
D.
不适用于引用流量太大的情况
【单选题】---Guess what? The university has accepted my application! ---Wow! That ’ s ___ news I ’ ve heard this year , Boris! Let ’ s celebrate!
A.
good
B.
better
C.
the best
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A.
正确
B.
错误
【判断题】河北省建筑工程消耗量定额( HEBGYD — A — 2012 )中材料数量带“()”者,表示基价中未含其价值或已分解材料的配合比
A.
正确
B.
错误
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