66. What’s the main idea of the passage?

　　A) Climates factors determine the plant distribution and composition of plant communities.

　　B) Global warming will cause major variation.

　　C) How has Brenner’s research team proved a truth.

　　D) C3 and C4 plants are important plants in determining the composition of plant communities.

　　Part V Cloze (15 minutes)

　　Directions: There are 20 blanks in the following passage. For each blank there are four choices marked A), B), C) and D) on the right side of the paper. You should choose the ONE that best fits into the passage. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.

　　When a person walks, the movement of his head, trunk, hipbones and limbs are all reflected in changes in his body. A computer 67 these changes into a database. Later, the computers can accurately 68 him according to these changes. This is a new biological identification method and it can quickly identify an examinee 69 disturbing him. It's especially suitable for use in airports and supermarkets.

　　Everybody's voice is 70 . When a person's voice is recorded by an ___71___, its voice frequency spectrum is called his sound print. Like a fingerprint, everybody's sound print is different. How can computers 72 his sound? First, his voice is recorded, which allows the computers to become familiar ___73___ his voice. It will then turn his sound characteristics into a ___74 of digits. These digits ___75___ the frequency, pitch and rhythm of the person's voice. These are the 76 on which the computers can distinguish his voice from 77 .

　　When that person needs to be identified, after he says only one word or two, the computers can identify him. The computers can even identify sounds coming 78 the wires. This will provide a safer 79 to electric banks and electric purchases.

　　We often bring ID cards, work cards, or driver licenses with us to ___80___ our identity. If all these cards are forgotten or lost, how can we prove 81 we are? In fact, it's not difficult to prove whom you are, because your body 82 has identifying markers. Some are physiological features, such as fingerprints, sounds, facial types and eye color. The computer can help to identify you. __83__ your features have already been stored in the database. To identify you, we have to take your picture with a camera and send it to a computer for 84 . First, the computer needs to reposition this picture according to the position of your eyes, and then starts to read the message of your physiological features such as the 85 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 86 .

　　67. A checks B stores C revises D modifies

　　68. A identify B distinguish C convey D strike

　　69. A without B with C for D in

　　70 A identical B similar C unique D sole

　　71. A implement B appliance C instrument D equipment

　　72. A hear B understand C record D distinguish

　　73 A to B in C on D with

　　74. A series B package C line D pair

　　75. A reverse 　　B represent C reveal D recession

　　76. A origin B cause C reason D basis

　　77 A other's B another's C each other's D one another's

　　78. A at B on C in D through

　　79. A assure B guarantee C ensure D confirm

　　80. A cause B make C prove D leave

　　81 A whom B how C what D where

　　82. A oneself B themselves C itself D himself

　　83 A Provide B Suppose C Imagine D Give

　　84. A processing B copying C coloring D revising

　　85. A size B type C ratio D shape

　　86. A recommendation B contribution C proposal D decision