Because the roads are crowded with cars.I prefer here rather than ．( )A．cycling, drivingB．to cycle, driveC．cycle, to driveD．cycling, to drive 题目和参考答案——青夏教育精英家教网—

题目内容

11．Because the roads are crowded with cars，I prefer here rather than ．（　　）

	A．	cycling； driving		B．	to cycle； drive
	C．	cycle； to drive		D．	cycling； to drive

分析考查动词用法．句意：路上挤满了小车，于是我愿骑自行车而不愿开车．

解答答案：B，考查固定搭配"prefer to do…rather than do宁愿做…不愿做"，所以选B，还要注意句式：prefer doing to doing．宁愿做…不愿做．

点评 prefer的其他用法：prefer to do/prefer doing宁愿做．

练习册系列答案

2．Sun Yat-sen founded the first Republic in China in 1911after many years'fighting．

19．She seemed to be excited about this journey．
It seemed that shewas excited about this journey．

6．It took them a very long time to rescue the wounded．
Theyspent a very long timerescuing the wounded．

16．Most people prefer to stay indoors during a snowstorm，but Kenneth Libbrecht is different from most people．When snow starts falling down from the winter sky，the scientists work begins．Taking a magnifying glass （放大镜），a paintbrush，and a camera with him，he heads out into the cold．
Outside，Libbrecht waits for snowflakes（雪花） that are just right．Sometimes he waits for hours．Finally，he sees the snowflakes he has been waiting for．As the snowflakes fall，Libbrecht carefully catches them on his paintbrush．Then he points his camera and shoots．
The scientists shiny pictures recently earned him a prize，which is given to top science photographers around the world．
Libbrecht takes pictures of snowflakes to learn more about their shapes．The snowflakes form when water steam in a cloud freezes．Every snowflake grows into a hexagon．That is a six-sided shape．However，no two snowflakes look the same．Experts are not sure why．
To find the answer，Libbrecht has traveled to snowy places around the world．He has taken pictures of snowflakes in Canada，Alaska，and Vermont．The work takes patience，Libbrecht explained．"It doesn′t snow all the time，and when it does，the snowflakes aren′t always good，"he said．Once he has collected enough pictures，he returns to his science lab in California to do research．
Since developing his interest in snowflakes，Libbrecht has collected nearly 10，000snowflake pictures．He will spend most of his winter studying them．The scientists outdoor work is far from over，though．Libbrecht plans to one day go to other snowy places to take more photos．
"I really enjoy watching the snow fall and trying to see what I can find，"he said．"There is a lot of fun．"
Kenneth Libbrecht also gave some good advice to kids who want to study snowflakes．"You don′t need a lot of things．With a simple magnifying glass on a snowy day，you can really see quite a bit of them if you just stop and look．"

56．Paragraph 2 is mainly aboutC．
A．how snow forms
B．what snowflakes look like
C．how Libbrecht takes pictures of snow
D．what Libbrecht plans to do next
57．Why does Libbrecht take pictures of snowflakes？A
A．To study their shapes．
B．To enjoy the snow．
C．To find pleasure．
D．To win a prize．
58．Libbrecht thinks his workA．
A．interesting B．simple C．creative D．difficult
59．Libbrecht advised kids who want to study snowflakes toA．
A．stop and watch
B．buy a good camera
C．be patient
D．spend much time．

3．AIDS researchers say they still have much work to do on a vaccine （疫苗）against HIV．But the first reports of some success have raised hopes．（33）C
The study was designed to test for two abilities．One was the ability of the vaccine to prevent HIV infections．The other was its ability to reduce the amount of virus in the blood of people who became infected during the study．
Volunteers received vaccinations over a period of six months and were tested for HIV for an additional three years．The study began in 2003．It was the largest AIDS vaccine trial yet．（34）F    Half received the vaccine．The other half received a placeho，an inactive substance （物质）．The volunteers did not know which they were getting．
Seventy-four people in the placeho group became infected during the study．（35）D  Doctor Supachai Rerks-Ngarm，who led the study for the Thai Ministry of Public Health，called it a scientific breakthrough．
The National Institutes of Health also took part．Doctor Anthony Fauci at NIH called the findings an important step forward．（36）G But he also said additional research was needed to better understand how the vaccine reduced the risk in those individuals．
The vaccine did not lower the amount of virus in the blood of volunteers who became infected during the study．The study was based on versions of HIV commonly found in Thailand．The volunteers received a combination of two vaccines．（37）A  The second，or booster，vaccine was developed by VaxGen．The nonprofit group Global Solution for Infectious Diseases now has rights to it．
Neither vaccine had been successful by itself when tested earlier．More detailed results of the study are expected to be presented at an AIDS vaccine conference in Paris next month．

A．The first，or prime，vaccine came from the Sanofi Pasteur company．
B．The AIDS vaccine raises hopes for those who get infected and will defeat the disease thoroughly．
C．Scientists say an experimental vaccine reduced the risk of infection in humans by thirsty-one percent and was safe．
D．The researchers say that was compared with only fifty-one of those who received the vaccine．
E．AIDS is a very serious phenomenon in Thailand．
F．It involved more than sixteen thousand adults in Thailand．
G．He said it represented the first time an investigational HIV vaccine had shown some ability to prevent infection．

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