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问题 单项选择题

2013年7月10日至11日，第五轮中美战略与经济对话在美国首都华盛顿举行。双方围绕落实两国元首安纳伯格庄园会晤共识、推进中美新型大国关系建设坦诚、深入地交换了意见，达成了共识，取得了重要积极成果。中美战略与经济对话机制（）。

①以两国间利益完全一致为基础

②在建立国际新秩序中发挥着重要作用

③是当今时代主题发展变化的产物

④是中美两国对话合作的重要平台

A.①②

B.①③

C.②④

D.③④

答案

参考答案：C

多项选择题

后评价通过( )等方面判定项目的成功度。

A．工程

B．质量

C．技术

D．经济

E．效益
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单项选择题

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 Martin Bidartondo of the University of California at Berkeley 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, says Bidartondo, 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 my corrhizal 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.\

15（）

A. in turn

B. in fact

C. in return

D. in the end
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