BOI DUONG HS GIOI 9

PRETEST 11

I.Use the verb in parentheses in their correct tense forms:

1. Mathematics(1.be)quite a simple subject. It (2.be)easy to do well in it. Once you (3.know) the basic principles, the rest (4.be)easy.
2. For a long time, I (1.think) of buying a cupboard. Now I (2.have) the money, so I (3.buy) one right away.
3. I (1.already/ write) the letter. Nobody here (2.have) a stamp, so I (3.have) to go to the post-office tomorrow.

II. Read the passage and choose the best answer:
One of the initial uses of computer graphics, and ultimately its greatest use, has been as an aid to design, generally referred to as computer-aided design (CAD). One of its greatest advantages is that designers can see how an object will look after construction and make changes freely and much more quickly than with hand drafting. For three-dimensional rendering of machine parts, engineers now rely heavily on CAD. Automobile, spacecraft, aerospace, and ship designers use CAD techniques to design vehicles and test their performance. Building designs are also created with computer graphics systems. Architects can design a building layout, create a three-dimensional model, and even go for a simulated "walk" through the rooms or around the outside of the building.
Business graphics is another rapidly growing area of computer graphics, where it is used to create graphs, charts, and cost models to summarize financial, statistical, mathematical, scientific, and economic data. As an educational aid, computer graphics can be used to create weather maps and cartographic materials. Computer art also has creative and commercial art applications, where it is used in advertising, publishing, and film productions, particularly for computer animation, which is achieved by a sequential process.
1. What does the passage mainly discuss?
a. Routine uses of computers b. Computer graphics applications
c. The rapidly growing field of computer science d. Computers as the architects of the future
2. The word "it" in line 10 refers to
a. computer graphics b. computer science
c. production of picture d. computer
3. According to the passage, architects use CAD to
a. inspect buildings b. create graphs
c. make cartographic materials d. create three-dimensional models
4. According to the passage, engineers use CAD for
a simulated "walk" through model rooms b. rendering machine parts
c. making cost models d. advertising
5. The paragraph following this passage would most likely be about
a. computer animation b. flight training
c. cost models d. applications of CAD in medicine

III. Read the passage and decide following sentences are true or false:
Scientists claim that air pollution causes a decline in the world`s average air temperature. In order to prove that theory, ecologists have turned to historical data in relation to especially huge volcanic eruptions. They suspect that volcanoes affect weather changes that are similar to air pollution. One source of information is the effect of the eruption of Tambora, a volcano in Sumbawa, the Dutch East Indies, in April 1815. The largest recorded volcanic eruption, Tambora threw 150 million tons of fine ash into the stratosphere. The ash from a volcano spreads worldwide in a few days and remains in the air for years. Its effect is to turn incoming solar radiation into space and thus cool the earth. For example, records of weather in England show that between April and November 1825, the average temperature had fallen 4.5o F. During the next twenty four months, England suffered one of the coldest periods of its history. Farmers` records from April 1815 to December 1818 indicate frost throughout the spring and summer and sharp decreases in crop and livestock markets. Since there was a time lag of several years between cause and effect, by the time the world agricultural commodity community had deteriorated, no one realised the cause.
Ecologists today warn that we face a two-fold menace. The ever-present possibility of volcanic eruptions, such as that of Mt. St. Helens in Washington, added to man`s pollution of the atmosphere with oil, gas, coal and other polluting substances, may bring us increasingly colder weather.
It is believed that the earth gets hotter when volcanoes erupt.
Because incoming radiation is turned into space, there is a decline in the world`s average air temperature.
The effects of Tempora`s eruption were evidence of pollution`s cooling the earth.
The effects of Tempora`s eruption affected only Sambawa, the Dutch East Indies.
The cause of cold weather in England from 1815 to 1818 was volcanic ash in the atmosphere.
The cold weather in England from 1815 to 1818 seriously affected crop and livestock