Why does the author mention Neolithic towns in paragraph 2？
A. To give an example of a civilization
B. To explain the invention of writing systems
C. To argue that they should be classified as villages
D. To contrast them with the civilizations that evolved
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Which of the sentences below best expresses the information in the highlighted statement in the passage？ The other choices change the meaning or leave out important information.
A parasite is less likely to destroy the host when it attaches itself at first.
B. Parasites that have lived on a host for a long time have probably done a lot of damage.
C. The most destructive phase for a host is when the parasite first invades it.
D. The relationship between a parasite and a host will evolve over time.
According to paragraph 5, why would life on Titan be improbable？
A. It does not have an ocean.
B. It is not a planet.
C. It is too cold.
D. It has a low atmosphere.
What does the author mean by the last sentence of the text？
A. Wireless recharging is too wonderful to be true.
B. Wireless recharging is consistent with the laws of nature.
C. Wireless recharging will definitely come true finally.
D. Wireless recharging will surely enter the mainstream in the end.
In the talk, the professor provides several examples of deserts from around the world. Indicate which geographical or climatic feature formed these deserts. One of the answer choices will NOT be used. Click in the correct box for each phrase.
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