We received a SOS signal appearing right here in this city, please connect the support team there immediately.
A. a SOS
Giải bởi qa.haylamdo.com
Kiến thức: Từ vựng
* connect sb to sb/sth: nối máy
* contact sb: liên lạc với ai
Sửa: connect => contact
Tạm dịch: Chúng tôi đã nhận được tín hiệu SOS xuất hiện ngay tại thành phố này, vui lòng liên lạc nhóm hỗ trợ ở đó ngay lập tức.
Chọn đáp án C
According to paragraph 4, which of the following is the reason why satellites move out of the way?
If you want to be kept informed about current affairs you should listen to the radio.
Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following questions.
Read the following passage and mark the letter A, B, C or D on you answer sheet to indicate the correct answer to each of the questions.
SCIENTIFIC DISCOVERIES
A satellite is best understood as a projectile, or an object that has only one force acting on gravity. Technically speaking, anything that crosses the Karman Line at an altitude of kilometers (62 miles) is considered in space. However, a satellite needs to be going fast — at least 8 km (5 miles) a second - to stop from falling back down to Earth immediately.
If a satellite is traveling fast enough, it will perpetually "fall" toward Earth, but the Earth's curvature means that the satellite will fall around our planet instead of crashing back on the surface. Satellites that travel closer to Earth are at risk of falling because the drag of atmospheric molecules will slow the satellites down. Those that orbit farther away from Earth have fewer molecules to contend with.
There are several accepted "zones" of orbits around the Earth. One is called low-Earth-orbit, which extends from about 160 to 2,000 km (about 100 to 1,250 miles). This is the zone where the ISS orbits and where the space shuttle used to do its work. In fact, all human missions except for the Apollo flights to the moon took place in this zone. Most satellites also work in this zone.
Geostationary or geosynchronous orbit is the best spot for communications satellites to use, however. This is a zone above Earth's equator at an altitude of 35,786 km (22,236 mi). At this altitude, the rate of "fall" around the Earth is about the same as Earth's rotation, which allows the satellite to stay above the same spot on Earth almost constantly. The satellite thus keeps a perpetual connection with a fixed antenna on the ground, allowing for reliable communications. When geostationary satellites reach the end of their life, protocol dictates they're moved out of the way for a new satellite to take their place. That's because there is only so much room, or so many "slots" in that orbit, to allow the satellites to operate without interference.
While some satellites are best used around the equator, others are better suited to more polar orbits - those that circle the Earth from pole to pole so that their coverage zones include the north and south poles. Examples of polar-orbiting satellites include weather satellites and reconnaissance satellites.
(Source: https://www.space.com/24839-satellites.html)
Which of the following best serves as the title for the passage?
Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of the primary stress in each of the following questions.
To show the different ideas about love and marriage, a survey was conducted in American, Chinese and Indian students.
Which of the following is mentioned in paragraph 4 as an element that makes a satellite stay above the same spot on Earth?
We got wet yesterday because we didn't remember to bring our raincoats.
Read the following passage and mark the letter A, B, C or D on your answer sheet to choose the word or phrase that best fits each other numbered blanks.
MARITAL PROBLEMS
When people marry, they're usually in love and happy to be tying the (46) _______. But after that, things tend to change. On average, couples' satisfaction with their marriage declines during the first years of marriage and, if the decline is particularly steep, divorce may follow. The course of true love runs downhill.
For around 30 years, researchers have studied how having children affects a marriage, and the results are (47) ________: the relationship between spouses suffers once kids come along. Comparing couples with and without children, researchers found (48) _________ the rate of the decline in relationship satisfaction is nearly twice as steep for couples who have children than for childless couples. In the (49) ________ that a pregnancy is unplanned, the parents experience even greater negative impacts (50) ________ their relationship.
The irony is that even as the marital satisfaction of new parents declines, the likelihood of them divorcing also declines. So, having children may make you miserable, but you'll be miserable together.
<https://www.theguardian.com]>
