20．People around the country were excited __________ the astronauts came back to the earth safely．（　�。�
A．unlessB．butC．untilD．because

分析 句意：全國(guó)各地的人們都很激動(dòng)，因?yàn)橛詈絾T安全地返回地球．

解答 答案：D．根據(jù)People around the country were excited （全國(guó)各地的人們都很激動(dòng)）和the astronauts came back to the earth safely（宇航員安全地返回地球）可知前后是因果關(guān)系，四個(gè)選項(xiàng)的含義分別是A．unless除非； B．but但是；C．until直到；D．because因?yàn)椋蔇正確

點(diǎn)評(píng) 考查從屬連詞．
1．because 是連詞，其后接句子，例 如：
He is called Mitch，because his name is Mitchell．
2．because of 是復(fù)合介詞，其后接名詞、代詞、動(dòng)名詞、what 從句等．例如：
We could see him wasting away because of his illness．

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源： 題型：填空題

10．Only important people wereadmitted （容許，接納）to the opening ceremony．

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

11．______ your help，we wouldn't have done the work so well．（　�。�
A．But forB．Except forC．If onlyD．Only if

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：閱讀理解

8．Hundreds of years ago，life was harder than it is today．People didn't have modern machines．There was no modern medicine，either．
　　Life today has brought new problems．One of the biggest is pollution．Water pollution has made our rivers and lakes dirty．It kills our fish and pollutes our drinking water．Noise pollution makes us talk louder and become angry more easily．Air pollution is the most serious kind of pollution to all living things in the world．
　　Cars，planes and factories all pollute our air every day．Sometimes the polluted air is so thick that it is like a quilt （被狀物） over a city．This kind of quilt is called smog．
　　Many countries are making rules to fight pollution．Factories must now clean their water before it is thrown away，and they mustn't let dirty smoke go into the air．
　　We need to do many other things．We can put waste things in the dustbin and do not throw them on the ground．We can go to work by bus with our friends in the same car．If there are fewer people driving，there will be less pollution．
　　Rules are not enough．Every person must help to fight pollution．
51．Hundreds of years ago，life was much harder than it is today becauseC．
A．there were not any modern machines
B．there was no modern medicine
C．both A and B
D．there were not many people
52．What is the biggest problem in today's life？D
A．Water pollution
B．Air pollution
C．Noise
D．Pollution
53．The most serious kind of pollution isB．
A．noise pollution
B．a(chǎn)ir pollution
C．water pollution
D．A，B and C
54．Factories must clean their waterD．
A．before they are thrown away
B．when they are thrown away
C．a(chǎn)fter it is thrown away
D．before it is thrown away
55．From the passage we know thatD．
A．a(chǎn) few years ago，there was no smog at all
B．today people don't have to talk to each other in a loud voice
C．we can drink water from the polluted rivers and lakes
D．people are making rules in order to fight pollution．

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

15．I have no dreams          to have a happy life．（　�。�
A．rather thanB．more thanC．other thanD．less than

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

5．His humorous closing speech was a welcome addition to the ______dull meeting．（　�。�
A．thereforeB．meanwhileC．otherwiseD．thus

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

12．A fierce fire broke out there last night．______，most of the building was burnt to the ground．（　�。�
A．As a matter a factB．As result
C．As consequenceD．Consequently

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：選擇題

9．Where and why he came here ______ yet．（　�。�
A．is not knownB．are not known
C．has not knownD．have not been known

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源： 題型：閱讀理解

9．Sina Weibo，one of the country's most popular micro-blogging sites，has launched a paid service．For a 10yuan （$l.57）monthly fee，users get a membership on their Sina Weibo accounts．
According to Xu Yuanyuan，a member of the marketing team at Sina，the move is to guarantee a more convenient and safer environment for users．But despite the company's efforts to increase income，it seems that most of its 300million users still prefer the free version．
The premium membership （高級(jí)會(huì)員） plans，announced by the company on Monday，brought about negative comments from its users．
"The current service is good enough for me"，said a Beijing-based micro-blogger．"I don't really need those value-added services and it might be a waste of money．I might consider paying for it if some more features are added．"
Dong Xu，an analyst with consulting firm Analysis International，said that Sina shouldn't expect a great incrase in income brought by the new services．The free services are enough for most users，Dong said．"The company has been making attempts at different profit models since last year．A potential source of income could be gaming．Games and advertisements are so far te two biggest sources of income．"she said．
Other micro-blogging service providers have not yet followed suit．Fang Gang，vice-president of rival Sohu，said via e-mail on Tuesday that Sohu's micro-blogging service will never charge users．"It's good news for us．Users can come to our website if they have to pay for services （at Sina）．"Fang said．

26．Most of Sina Weibo's users．B
A．a(chǎn)ren't satisfied with its free version        
B．show no interest in its paid services
C．a(chǎn)re looking forward to new services  
D．think highly of its new paid version
27．What's Dong Xu's attitude towards Sina Weibo's new services increasing income？A
A．Negative．
B．Confident．
C．Indifferent．
D．Positive．
28．Why did Fang Gang consider Sina Weibo's charging its users good news？C
A．Because Sina ill make more money．
B．Because Sina will lose the whole Weibo market．
C．Because Sohu will attract more users．
D．Because Sohu will offer free services．
29．What can be inferred from the text？D
A．Most of Weibo websites will charge their users．
B．Sina Weibo's new move will be a great success．
C．Sina Weibo's users will enjoy more services．
D．A large number of Weibo users like playing games．
30．What can be the best title for the text？B
A．Sina Weibo Faces Great Challenges        
B．Sina Weibo Launches Paid Services
C．Sina Weibo Expects Income Increase       
D．Sina Weibo Becomes More Convenient．

查看答案和解析>>

同步練習(xí)冊(cè)答案