请问大家这道题大家什么思路，谢谢

richgodmanUID：2204517

5：Opportunists must constantly invade new areas to compensate for being displaced by more competitive species. Human landscapes of lawns, fields, or flowerbeds provide settings with bare soil and a lack of competitors that are perfect habitats for colonization by opportunists. █Hence, many of the strongly opportunistic plants are the common weeds of fields and gardens. █
Because each individual is short-lived, the population of an opportunist species is likely to be adversely affected by drought, bad winters, or floods. █If their population is tracked through time, it will be seen to be particularly unstable—soaring and plummeting in irregular cycles. █

11. Look at the four squares █ that indicate where the following sentence could be added to the passage.

Such episodic events will cause a population of dandelions, for example, to vary widely.

Where would the sentence best fit? Click on a square █ to add the sentence to the passage.
请问大家这道题大家什么思路，我是选的4，答案是3

fish1044UID：2190500

我的理解：
这里的episodic events是指drought, bad winters, floods。
这句话放在3后面，是个补充举例。

jjs1986UID：2478040

主语对应前句的drought, bad winters, or floods，宾语补足语对后句的particularly unstable

richgodmanUID：2204517

o,谢谢大虾们，一开始我理解错了，认为SUCH EPISODIC EVENTS指代SOARING AND PLUMMETING去了