考研考试

【单选题】Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live, Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌).But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist MartinBidartondo of the University ofCalifornia atBerkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, saysBidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.
Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called mycorrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon. With a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment.\
A．in turn
B．in fact
C．in return
D．in the end

网考网参考答案：C
网考网解析：
[解题思路] 词组辨析。in turn意为“反过来”；in fact意为“事实上”；in return意为“作为回报”；in the end意为“最后”。文章指出，植物和真菌之间形成了共生关系，真菌帮助绿色植物吸收矿物质，作为回报，植物给真菌提供糖分。in return符合题意。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>