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问题

宣告英属北美13个殖民地独立的事件是

A．来克星顿的枪声

B．《独立宣言》的发表

C．萨拉托加大捷

D．1787年宪法的颁布

答案

答案：B

题目分析：宣告英属北美13个殖民地独立的事件是1776年7月4日《独立宣言》的发表，故选B。来克星顿的枪声是独立战争开始的标志，萨拉托加大捷是转折点，1787年宪法的颁布开创了三权分立的民主体制。

点评：关于《独立宣言》的发表，还可以考查的是起草者是托马斯·杰斐逊，发表机构是第二届大陆会议；关于独立战争的史实，学生还要知道，1775年来克星顿的枪声是独立战争开始的标志；萨拉托加大捷是美国独立战争的转折点；1781年约克镇战役标志着独立战争军事对抗阶段结束；1783年美英签署《巴黎和约》，英国正式承认美国独立。

单项选择题 A1/A2型题

《素问·至真要大论》认为，“诸寒收引，皆属于肾”，其“肾”指的是（）

A.肾阳虚

B.肾阴虚

C.肾气虚

D.肾不藏精

E.肾不主水
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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.\

2（）

A.for

B.with

C.to

D.without
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