精英家教網 > 高中英語 > 題目詳情
7．More visitors ___________ to Beijing since the repair project was completed．（　　）
A．were broughtB．are brought
C．will be broughtD．have been brought

分析 自從修繕工程完成后，更多的游客被帶到了北京．

解答 答案是D． 考查被動語態(tài)，主語visitors與動詞bring 之間是被動關系，since引導的時間狀語中主句要用have+過去分詞，所以答案選D．

點評 被動語態(tài)由"助動詞be+及物動詞的過去分詞"構成．被動語態(tài)的時態(tài)變化只改變be的形式，過去分詞部分不變．疑問式和否定式的變化也如此．掌握各種時態(tài)的被動語態(tài)是解題的關鍵．

練習冊系列答案
相關習題

科目：高中英語 來源： 題型：閱讀理解

17．Back in the 1860s，a British scientist named Henry Walter Bates noticed something interesting in the animal world：some harmless animals change the color or patterns of their skin to pretend to be deadly．For example，a kind of butterfly，Common Mormon，can change the pattern on its wings so that it looks like another butterfly species，the Common Rose，which is poisonous for birds to eat．
    Bates argued that animals develop this ability to protect themselves from being eaten．This theory had been widely accepted by scientists．But one question remains：how do these animals manage to do that？
    After more than 150 years，scientists are finally able to answer that question-it is all down to a gene called"doublesex"，according to a study published on March 6 in the journal Nature．
    In fact，scientists have long known that genes are responsible for this useful ability．Just like your hair color and the shape of your eyes are determined by your genes，the patterns on a butterfly's wings can be explained similarly．But until the new study，scientists hadn't been able to find out which genes in particular were responsible．
    Encouraged by the development of new technologies for studying genes，scientists at the University of Chicago，US decided to give it another try．They compared the genetic structure of the Common Mormons that changed their wing patterns with those of ones that did not．And all the results pointed to a single gene，"doublesex"．
This was much to the scientists'surprise．They used to expect that something as complex as this would be controlled by many different genes．For example，one gene would control the color of the upper part of the wing，one would do so for the lower part and one would control wing shape．
    However，the"doublesex"gene doesn't quite do everything by itself．Instead，it acts like a switch-it"tells"other genes to change the wing patterns．Isn't that clever？
    Scientists believe that this special ability of the"doublesex"gene was developed throughout the long history of evolution．"The harmless species gains an advantage by resembling something predators （捕食動物） avoid，"Sean Carroll，a scientist at the University of Wisconsin-Madison，US told Nature．"It was obvious evidence for natural selection．"
63．What was newly discovered by scientists at the University of Chicago？D
A．Some animals can change their skin color．
B．Some butterflies can disguise themselves as other species．
C．Genes are responsible for the change in animals'skins．
D．Common Mormons change their skin patterns due to a certain gene．
64．What surprised scientists in the study？C
A．So many genes are involved in the change of patterns．
B．The genetic structure of the butterflies is so complex．
C．A single gene determines the change of patterns．
D．The gene"doublesex"singlehandedly changes the wing patterns．
65．Which of the following is the best title？B
A．A new discovery                  
B．How butterflies stay safe
C．A gene called"doublesex"
D．Natural selection．

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

18．Gov．David Paterson______ to account for his actions．If he can show that he did no wrong，he must do so．If not，he should resign．（　�。�
A．has failedB．had failedC．is failingD．failed

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

15．You'd sound a lot more polite if you make a request _________ a question．（　�。�
A．in search ofB．in the form ofC．in need ofD．in memory of

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

2．Many young people in our country spend more money than they have by using credit cards，so   they are always       ．（　�。�
A．in peaceB．in debtC．in reliefD．in danger

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

12．---Is there anything you'd like for dinner？
---No，nothing ____．（　�。�
A．in placeB．in returnC．in particularD．in turn

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

19．________ everybody is here，let's begin our meeting ahead of schedule（日程表）．（　�。�
A．SinceB．WhenC．AfterD．Although

查看答案和解析>>

科目：高中英語 來源： 題型：選擇題

16．Some inventions are well received，but _______ function，they aren't very successful．（　�。�
A．according toB．in terms ofC．regardless ofD．owing to

查看答案和解析>>

科目：高中英語 來源： 題型：填空題

17．His wish istogoabroadfor further education．（出國深造）

查看答案和解析>>

同步練習冊答案