{{B}}Lichens{{/B}} To be certain, a lichen is not the most
conspicuous of plants. Lichens grow in unassuming fashion on rocks, logs and
other exposed surfaces in a wide range of habitats around the world. To the
untrained eye they look like little more than crusty patches that, at first
glance, might easily be mistaken for a discoloration of the surface. Even if the
average person should happen to notice the lichen’s presence and correctly
identify it as some form of life, he is unlikely to go much further in
contemplating it. Though almost totally ignored by the layperson, for the
botanist, lichens are one of the most fascinating of all plants, and one of the
most intensely studied. They are the subject of so much
scientific scrutiny primarily because a lichen is n A. Very little is known about the internal structure of lichen. B. The true nature of lichen is not readily apparent. C. Lichen is the only composite plant known to exist. D. Lichen is a very well-understood kind of plant.
[单项选择] {{B}}Narrator{{/B}} Listen to a part of a conversation in
library.
Why is the student in the library A. To fill in a form. B. To join the video library. C. To do a survey. D. To help the librarian.
[单项选择] {{B}}Reading Section Directions{{/B}} In this section you will
read five passages and answer reading comprehension questions about each
passage. Most questions are worth one point, but the last question in each set
is worth more than one point. The directions indicate how many points you may
receive. You will have 60 minutes to read all of the passages
and answer the questions. Some passages include a word or phrase that is
underlined in blue. Click on the word or phrase to see a definition or an
explanation. When you want to move on to the next question,
click on {{B}}Next{{/B}}. You can skip questions and go back to them later as long
as there is time remaining. If you want to return to previous questions, click
on {{B}}Back{{/B}}. You can click on {{B}}Review{{/B}} at any time and the review screen
will show you which question you have answered and which you have not. From this
review screen, you may go directly to any question you have A. To tell the reader where they can find this kind of new car. B. To make his description more interesting to attract the readers’ attention. C. To show that the new car is so designed that it is startlingly different. D. To tell the readers the new car can only exit in an imaginative world.
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