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【单选题】
生态系统的功能主要是（ ）A.
维持能量流动和物质循环
B.
保持生态平衡
C.
为人类提供生产和生活资料
D.
通过光合作用制造有机物
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反馈参考答案：
举一反三
【单选题】In its early days, a penny paper often ______.
A.
paid much attention to political parties
B.
provided stories that hit the pubic taste
C.
offered penetrating editorials on various issues
D.
covered important news with inaccuracy
【简答题】In a good cartoon, the artist can tell in a few lines as much as a writer can tell in half a dozen paragraphs. The cartoonist not only tells a story but he also tries to 1)______ the reader to his way...
【判断题】The political details and the ramifications of political and legal events are often more transparent in a domestic situation than they are in a foreign market.
A.
正确
B.
错误
【单选题】Often in a political campaign, the vote of the _______________ is critical. A. Traditional B. Marginal C. Uncommitted D. Active
A.
a
B.
b
C.
c
D.
d
【单选题】Often in a political campaign, the vote of the _______________ is critical.
A.
Traditional
B.
Marginal
C.
Uncommitted
D.
Active
【单选题】Political parties often differ in their views on various _____ concerning their own countries.
A.
ways
B.
measures
C.
issues
D.
patterns
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