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