正确答案: A

由毛细血管汇合而成

题目：静脉 （ ）

解析：A

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举一反三的答案和解析：

[单选题]The Voice of America began during the World War II when Germany was broadcasting a radio program to get international (21) . American officials believed they should (22) the German broadcast with words that they thought were the facts of world (23) . The first VOA news report began with these words in (24) : "The (25) may be good or bad, but we shall tell you the truth." Within a week, other VOA (26) were broadcasting in Italian, French and English.After the World war II (27) in 1945, some Americans felt VOA's (28) had to be changed, (29) the Soviet Union (苏联)became the enemy of America. They wanted to reach Soviet listeners. Then VOA began broadcasting in Russian.

support

解析：21．答案为C  本题为词汇题，要求正确选择词义。A商务，业务，B文化，C支持，D信息。美国之音VOA的广播开始于第二次世界大战期间，与此同时德国正在利用无线电广播以获得国际(舆论)的支持。

[单选题]生态学的研究方法大多与生物学的方法相似是由于（ ）

生态学最初属于生物学的分支

[多选题]盲肠和结肠的形态为( )

沿肠的纵轴排列有三条平行的结肠带

肠壁在相邻韵两条结肠带之间外膨出呈袋状结构，称为结肠袋搿

结肠带附近有许多含脂肪组织的浆膜突起称肠脂垂

解析：CDE

[单选题]提出“惟陈言之务去”的写作主张的是（ ）

韩愈

[单选题]在我国当前的基础教育课程改革中，要改变长期以来课程评价过分强调的哪一功能？

甄别与选拔

[单选题]《毕业歌》的曲作者是

聂耳

[单选题]高温对动物的有害影响是( )

破坏酶的活性，使蛋白质变性

[单选题]From this selection we may conclude that the king's crown______.

moved more water than pure gold of the same weight

解析：51．答案为B  此题为推断题。根据阿基米德定理，我们可以得出关于国王的王冠的结论，答案选B。