Jumpingspidersarevitalforagriculturepestcontrol,and　41　...

问题详情：

Jumping spiders are vital for agriculture pest control, and 　41　 species can even learn to distinguish the color red in their prey(猎物), a 2015 study　42　 (show). They are able to learn to associate this color 　43　 poisonous prey and avoid it or find out high quality prey.

Jumping spiders will consume almost any small pests, 　44　 (range) from caterpillars to flies. Not only does this　45　 (natural) reduce the amount of agricultural damage from insect pests, but it means farmers can avoid using chemical treatments 　46　(protect) their crops.

In total, a large number of jumping spiders, over 5,000 species, 　47　(find) on every continent except Antarctica by now. Being able to adapt to the environment is a key evolutionary skill. Since the spiders are able to distinguish 　48　 foods are nutritious, from those that are 　49　 (harm), they can stay alive longer and manage a wide　50　 (various) of pests.

【回答】

41．the

42．showed

43．with

44．ranging

45．naturally

46．to protect

47．have been found

48． which

49．harmful

50．variety

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