HAD THE ANNOUNCEMENT BEEN MADE EARLIER, MORE PEOPLE WOULD HAVE ATT...
61. Had the announcement been made earlier, more people would have attended the lecture.
A. The lecture was held so late that few people attended it.
B. More people came late to the lecture because of the late announcement.
C. The late announcement helped make the lecture well – attended.
D. Few people came to the lecture because the announcement was not made earlier.
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct
answer to each of the questions
Mars
What does this planet look like?
Mars, commonly referred to as "the red planet," is the fourth planet from the sun. Its reddish color
comes from the high amounts of iron oxide on its surface. Mars has surface features similar to those found
on the moon and on Earth. It has mountain ranges, volcanic fields, valleys, ice caps, canyons and deserts.
It has numerous impact craters including one, discovered in 2008, that measures more than 6,000 miles in
length and nearly 5,000 miles in width. It is, by far, the largest impact crater ever discovered. Mars is also
home to Olympus Mons, the highest discovered mountain in the solar system. A person standing on the
surface of Mars (in any location in which the mountain was visible) would have no chance of viewing the
top. With the peak at 88,600 feet, Olympus Mons is about three times as high as Mount Everest, the
highest peak on Earth. Mars' Valles Marineris is the solar system's largest canyon, measuring more than
seven miles deep.
How big is this planet?
Mars is much smaller than the Earth. Its surface area occupies 28% of Earth's, its mass is only 10
percent of Earth's and its volume is about 15 percent of Earth's.
How long does it take to orbit the sun? 687 days
What is its gravity like?
Gravity on Mars is 38% that of the Earth. A 100 pound Earthling would weigh 38 pounds on Mars.
How far is it from the sun? From the Earth?
On average Mars is located 138,000,000 miles from the sun. When Mars and Earth are on the
same side of the sun, the two planets may come within 35,000,000 miles of each other. When they are on
opposite sides of the sun, they may be as far as 399,000,000 miles apart.
What is its atmosphere like?
Mars has an extremely thin atmosphere. 95% of it is carbon dioxide, 3% is nitrogen, 1.6% is argon, and the
remainder consists of traces of oxygen and water.
What's the temperature like?
Of all the planets, temperatures on Mars are most similar to those on Earth. Temperatures can range from
about -220 F during a Mars (Martian) winter to a temperate 68 degrees F in summer, though on average
the temperature is about -80 F. Unlike Earth, however, the thin atmosphere gives rise to fearsome dust
storms that may envelop the entire planet and cause overall temperatures to rise.
How many moons does it have?
Mars has two moons, Phobos and Deimos. Both are small and irregularly shaped and may be former
asteroids. Interestingly, Phobos orbits Mars at a distance of only about 5,500 miles away from its center,
the closest any moon orbits its parent planet. In fact, if a person were to stand on Phobos and look toward
Mars, Mars would look apx. 6,400 times larger than the full moon appears from Earth - taking up almost a
quarter of the celestial hemisphere. Because Phobos has a particularly low orbit, scientists believe it will
eventually crash into Mars, or, break up into pieces, possibly forming rings around the planet.
Interesting facts:
*There has long been speculation concerning the possibility of life and or liquid water on Mars.
However, the planet's thin atmosphere prevents water from accumulating for any time over significant
portions of the planet. Some evidence on the planet's surface suggests the presence of liquid water at
some point in history, but scientists think this water would be too salty or acidic to support life as we know
it. Furthermore, fierce solar winds and poor heat transfer across its surface would make sustained life
virtually impossible. There is compelling evidence, however, that Mars was once much more habitable to
life than it is today.
* Many Spacecrafts have attempted to visit Mars, the most notable of which was NASA's Mariner