4.The passage is mainly developed by________.
A.providing examples
B.making comparisons
C.giving different figures
D.telling personal experiences
B
(2012·淮北高三第二学期重点中学联考)
Butterfly gardens can be grown throughout the United States.There is a wide variety of both butterflyattracting (nectar) plants and host plants covering climate zones throughout the country.Butterfly gardens can range
in size from a few containers placed in a sunny spot to several acres.
Nectarproducing (产蜜的) plants will attract butterflies to your garden.In order to support a full butterfly life cycle,host plants (for laying eggs and used as a caterpillar food source) must also be present.
Throughout the country,the general requirements
for butterfly gardening are the same:full sun,nectar source plants,larval (幼虫的)
host plants,a pesticidefree environment,and knowledge of the local butterfly
species.Many butterflyattracting plants are natives and require little attention,as they are naturally adapted to the region in which they live.
Butterfly gardens are best planted in spring with younger plants or in fall with mature plants that will become dormant quickly and reemerge in
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