According to Paragraph 6, why is manual uprooting a difficult process？
A. It requires divers to undergo strenuous training.
B. The algae's roots are usually too strong to pull out.
C. It is necessary to remove every last piece of algae.
D. The algae grow back faster than they can be removed.
查看答案
The word affords in the passage is closest in meaning to
A. lends.
B. provides.
C. costs.
D. teaches.
The word it in the passage refers to
A. device.
B. film.
C. window.
D. sequence.
It can be inferred from Paragraph 2 that the typical primary group
A. cannot supply everything an individual needs to be happy.
B. contains members that are emotionally healthy.
C. remains together for a long period of time.
D. does not encourage the formation of relationships outside the group.
What can be inferred from Paragraph 6 about a society with a high level of technological advancement？
A. Its primary groups are concerned mainly with acquiring material goods.
B. It is less common for people to commit to primary or secondary groups.
C. It allows its citizens to join more primary groups than those of other societies.
D. Its people form. secondary groups more often than primary groups.
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