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【单选题】
函数y=cos2x－sin2x+2sin xcosx的最周期和最大值分别是（ ）A.
B.
C.
D.
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举一反三
【判断题】Congressmen serve a term of six years while Senators serve a term of two years.
A.
正确
B.
错误
【判断题】Congressmen serve a term of six years while senators serve a term of two years.
A.
正确
B.
错误
【判断题】The Senate is composed of 100 Senators who are elected to serve for a term of 2 years.
A.
正确
B.
错误
【单选题】Senators are elected to serve ______ terms.
A.
two-year
B.
four-year
C.
six-year
D.
eight-year
【单选题】有关生态系统，以下表述正确的是( )。
A.
包括初级生产、次级生产和分解三个过程
B.
初级生产本质上是能量转化和物质积累过程
C.
次级生产过程也包括利用太阳能进行光合作用
D.
消费者主要指微生物
【判断题】The House Representatives serve a term of six years while Senators serve a term of two years.
A.
正确
B.
错误
【单选题】U. S. senators serve for______years after they are elected.
A.
four
B.
six
C.
three
D.
two
【单选题】Representatives serve __________ terms and senators serve __________years.
A.
two-year, 5
B.
three-year, 5
C.
two-year, 6
D.
three-year, 6
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