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It’s not surprising that sunspots(太阳黑子)were observed by ancient astronomers(天文学家).The largest sunspots on the sun can be seen without a telescope. It was not until the.invention of the telescope(望远镜)in the early 17th century, however，that systematic studies of sunspots could be undertaken.The great astronomer Galileo was among the first to make telescopic observations of sunspots.
Sunspots are regions of extremely strong magnetic fields(磁场)found on the sun’s surface.A sunspot has a dark central core known as the umbra.The umbra is surrounded by a dark ring called the penumbra，where the magnetic field spreads outward.Sunspots appear dark because they are giving off less radiation.They are cooler than the rest of the sun’s Surface.
Sunspots are frequently observed in pairs or in paired groups.The members of a spot pair are identified as the leading spot and the following spot.They are identified by their position in the pair in terms of the direction in which the sun rotates(旋转).
The number of sunspots at any one time varies。A large spot group may consist of as many as 1 0 groups and 300 Spots across the Sun.The number of spots changes in a fairly regular pattern called the sunspot cycle.The largest number occurs about every 11 years.At sunspot minimum，there are at most just a few small spots.
The average lifetime of an individual spot group is roughly one solar rotation，which is about 25 days.The most persistent large spots，however，can survive for two to three months
41. Careful observations and systematic studies of sunspots
A. were made by ancient astronomers.
B. started in the early 17th century.
C. were made by Galileo only.
D. could be made without a telescope.
42. Sunspots are cooler than the rest of the sun's surface because
A. they produce less energy.
B. they are buried in the sun.
C. they are far away from magnetic fields.
D. they are close to magnetic fields.
43. The leading spot and the following spot are the names of
A. two large sunspots.
B. a large spot and a small spot.
C. the two spots in a spot pair.
D. the central core and the ring around it.
44. If an intense sunspot activity-had occurred in 1857, the next one would have been in
A. 1858.
B. 1862.
C. 1865.
D. 1868.
45. In the last paragraph the word "persistent" means
A. important
B. effective.
C. enduring.
D. visible.
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Canada Ikea：What a Great Place for You to Shop
There are many different stores that people go to in order to buy various household goods______(46)The Canada Ikea(宜家)is not confined to one city alone in that country.Instead，you will find there are many different branches spread out in many different Localities
As with all of the Ikea stores the Canada Ikea deals mainly with selling top quality Swedish furniture________(47)One facet(方面)of the Canada Ikea that its customers will like is that the store has the ability of catering(迎合)to their English speaking customers as well as their French customers
To make shopping for furniture and other goods easy the Ikea stores in every country are all set out in the same manner________(48)As a result of this the Canada Ikea is one that its local and foreign customers enjoy visiting
To help make it easy for you to shop for the items that you want there are large blue and yellow bags or shopping carts available_______(49)
As you wander through the store you will find many interesting items that you can use for your home or even office.With these products you will have a beautiful house that you can live comfortably in you to shop______(50)The Canada Ikea is a great place for
A. This furniture is designed to provide the home owner with stylish(时髦的) furniture that is also affordable and perfect for everyday use.
B. With s0 many items to be found you are sure to want to buy everything that catches your fancy
C. These bags and carts are perfect for the many different lamp shades.cushions (垫子)，bed linens(亚麻布)，toys and other medium to small sized objects that you want.
D. This makes it very easy for visitors from other countries to buy the items they need without wandering around the store trying to find their goods.
E. One such store that you can find in many different countries including that of Canada is that of the Ikea chain of stores.
F . The larger sized objects are displayed in the showrooms of the Canada Ikea Stores.
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Biological Identification Technologies When a person walks，the movement of his head，trunk，and limbs(肢体)are a reflected in changes in his body.A.computer stores these database(数据库).Later，the computer can accurately to these changes.This is a new biological identification quickly identify an examinee without disturbing him.
Eve body’S voice is_______(51)into a_______(52)him according________(53)and it can_________(54).When a person’S voice is recorded by an instrument，his voice frequency spectrum(频谱)is called sound print fingerprint，eye.body’S sound print is different.How can a computer his sound? First，his voice is recorded_________(55)a fingerprint, everybody’s sound print is different. How can a computer________(56)his sound? First, his voice is recorded,________(57)allows the computer to become familiar with his voice.It will then turn his sound characteristics into a series of digits(数字).These are the _________(58)on which the computer can distinguish his voice from another's.
We often bring ID.cards，work cards，or driving licenses with US to _________(59)our identity.If all these cards are forgotten or lost，how can we prove whom we are? in________(60)，it's not difficult to prove whom you are________(61)your body itself has identifying markers.Some are physiological(生理的)features，such as fingerprints，一sounds，facial(面部的)types and eye color.The computer can________(62)to identify you.Suppose your features have already been________(63)in the database.To identify you.we have to take your picture with a camera and send it to a computer for________(64).First，the computer needs to reposition this picture according to the position of your eyes，and then starts to read the ________(65)of your physiological features such as the ratio of your pupil to the whites of your eyes and the shape of your nose.Next，it seeks matching records from the database.Finally, it makes a decision.
51. A.parts B.changes C.positions D.directions
52. A.identify B.inform C.affect D.bother
53. A.number B.card C.level D.method
54. A.soft B.loud C.unique D.clear
55. A.With B.Like C.For D.As
56. A.distinguish B.make C.gather D.develop
57. A.who B.where C.that D.which
58. A.reasons B.causes C.basis D.origin
59. A.prove B.create C.hide D.protect
60. A.all B.fact C.summary D.case
61. A.unless B.though C.so D.because
62. A.stop B.help C.mean D.continue
63. A.stored B.borrowed C.searched D.linked
64. A.printing B.researching C.processing D.filing
65. A.point B.picture C.size D.message
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2013年职称英语理工类完型填空重难点题目 2013年职称英语理工类完型填空