what does it refer to in i saw it, i saw it! ? (lines 3–4) (text 1a)
what does the author compare the cenote to in paragraph c? (text 1a)
what are arturo montero and guillermo de anda not investigating in the cenote? (text 1a)
what did luis un ken mean when he said, “the chaak moved.”? (line 64) (text 1a)
why is farming particularly difficult for the maya? (text 1a)
to get the best crops, what must happen immediately after the fields are burned? (text 1a)
what is the main purpose of paragraphs k and l? (text 1a)
with their sophisticated concepts of architecture, astronomy, and mathematics, the maya were among the greatest of all ancient civilizations. they ____________ for centuries, and at their peak, around a.d. 800, totaled 15 million people ranging from present- day mexico to honduras. then, suddenly, their society collapsed. consequently, people abandoned the cities and left immense pyramids in ruins. what caused the collapse of the maya civilization?
researchers now believe that climate change may be the answer. according to one study, a long period of dry climate, with three ____________ droughts, led to the maya’s end.
researchers who ____________ sediment from the yucatán peninsula found that these droughts matched downturns in the maya culture. it is believed that the maya were particularly at risk because their population depended wholly on lakes, ponds, and rivers that provided a supply of water for drinking and agriculture for just 18 months.
even when rain did come following a drought, water could not ____________ the soil because it was so dry and hard.
believers of the climate change theory say the droughts sparked a chain of events that led to the ____________ of the maya. “sunny days, in and of themselves, don’t kill people,” says richardson b. gill, author of the great maya droughts: water, life, and death. “but when people run out of food and water, they die.”
if someone plunges into a lake, he or she __________.
you __________ see through something that is transparent.
if you are astonished to see someone, you feel very __________.
the sacrifice of an animal during a religious ceremony means the __________ of it.
if you are abashed, you feel __________.
what was the author’s main purpose in writing this article? (text 1b)
the phrase by the sword (line 17) is closest in meaning to ______. (text 1b)
the word it in line 38 refers to ______. (text 1b)
we can infer from information in paragraph f that the greatest number of people in angkor worked as ______. (text 1b)
how did the climate in angkor change in the 1300s? (text 1b)
why does the author mention the little ice age in paragraph l? (text 1b)
if someone shows ingenuity when solving a problem, he or she shows ________.
if you ate subsequent to your arrival at the hotel, you ate ________ arriving at the hotel.
if you assume something, you ________.
a machine or system for doing something means __________ .
what images can radio telescopes capture that other telescopes cannot? (text 2a)
what is the purpose of paragraph b? (text 2a)
the phrase from scratch (line 114) is closest in meaning to _________. (text 2a)
which of these things happened last? (text 2a)
match the main ideas to the correct paragraphs. (text 2a) personal reactions to the trip in the desert
match the main ideas to the correct paragraphs. (text 2a) the challenges of building an observatory in the remote desert
match the main ideas to the correct paragraphs. (text 2a) how the work was completed over a five-year period
scientists on earth can expect to see photos about six months after the telescope has been __________ .
the best alternative title for this reading would be _______. （text 2b)
when this article was written, how many earthlike exoplanets had been discovered? (text 2b)
the author implies that on some exoplanets _______. (text 2b)
that does not mean that life is not present somewhere on a distant planet; instead, the lack of signals could be because radio waves are diminished as they travel across space. __________ , the great majority of their energy is wasted.
mind map of text a or text b.
what is this reading mainly about? （text 8a）
the word it in line 16 refers to _______. (text 8a)
in paragraph m, the author implies that _______. （text 8a）
what is true for both ants and bees? （text 8a）
in the first paragraph, what does the author imply? （text 8a）
based on what you have read, which of these business-management structures is most likely to be successful? （text 8a）
which of these could be considered an example of swarm intelligence? (text 8a)
what are nepenthes? (text 8b)
what is the book the superorgani about? (text 8b)
in paragraph l, the word some (line 149) refers to some ______. (text 8b)
what does the author say about leonardo in paragraph b? ( text a)
the word it in line 16 refers to _______. (text a)
in paragraph g, the author implies that verrocchio __________. (text a)
the metal for the bronze horse sculpture was eventually __________. (text a)
what does the author mean when he says, “he had no way to know that the few magnificent works he did complete would alone make his name immortal.” ? (lines 224–226) (text a)
what have researchers not discovered about the mona lisa? (text a )
leonardo da vinci was perhaps the greatest multitasker of all time, a genius who could work _________ as an painter, sculptor, inventor, engineer, and architect.
the phrase crude sketches in line 21 is closest in meaning to _______. (text b)
the word it in line 52 refers to _______. (text b)
what can we infer about plato? (text b)
which of these opinions would usama fayyad most likely agree.with? (text b)
this has enabled archeologists to learn more about a significant ________ in south america’s history, when various indigenous peoples were adjusting to the arrival of invading europeans.
________ is usually defined as the ability to read and write.
most languages ________ the sounds of the language into their written language.
some scholars argue that the complex system of chinese writing may be a ________ on the nation’s future development.