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【单选题】
自然条件下，生态系统能够在一段较长的时间内保持动态平衡，其主要原因是（）
A.
能量的增减随季节波动
B.
具有复杂的营养结构
C.
物质循环和能量流动反复进行
D.
生态系统具有一定的自动调节能力
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参考答案：
举一反三
【单选题】下列各函数中 , 在(-∞,0) 内为减函数的是 ( )
A.
y=7x+2
B.
y=
C.
y =-x 2 +2
D.
y =2x 2 -1
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【单选题】金曜日に飲み会があるんですけど、よかったら、( )。
A.
一緒に行く？
B.
一緒に行ってください。
C.
一緒に行きませんか。
D.
一緒に行こうよ。
查看完整题目与答案
【单选题】—I hear Ted got hurt badly in the car accident yesterday. — It's true. His careless driving was the of the accident. [     ]
A.
reason
B.
cause
C.
excuse
D.
answer
查看完整题目与答案
【单选题】The writer described Hamel as the best pilot but criticized his assistant for his carelessness in the flight.
A.
True
B.
False
C.
Not mentioned
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【单选题】The deadly accident _____ his careless driving.
A.
resulted in
B.
resulted of
C.
resulted from
D.
led to
查看完整题目与答案
【简答题】A. from French for "wrong," a civil wrong or wrongful act, whether intentional or accidental, from which injury occurs to another. B. failure to exercise the care toward others which a reasonable or p...
查看完整题目与答案
【单选题】The only means to achieve success ___ to appeal to arms.
A.
is
B.
are
C.
were
D.
have
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【单选题】Mr. Johnson ______ his boss ______ his careless mistake.
A.
apologized; about
B.
apologized to; about
C.
apologized to; for
D.
apologized; for
查看完整题目与答案
【单选题】下列各函数中,在(-∞,0)内为减函数的是?
A.
y=7x ＋ 2
B.
y=  -
C.
y = － x 2 ＋２
D.
y =2x 2 －１
查看完整题目与答案
【单选题】下列各函数中,在(- ∞,0)内为减函数的是
A.
y=7x+2
B.
y=-
C.
y=- +2
D.
y=2 - 1
查看完整题目与答案
相关题目：
【单选题】下列各函数中 , 在(-∞,0) 内为减函数的是 ( )
A.
y=7x+2
B.
y=
C.
y =-x 2 +2
D.
y =2x 2 -1
查看完整题目与答案
【单选题】金曜日に飲み会があるんですけど、よかったら、( )。
A.
一緒に行く？
B.
一緒に行ってください。
C.
一緒に行きませんか。
D.
一緒に行こうよ。
查看完整题目与答案
【单选题】—I hear Ted got hurt badly in the car accident yesterday. — It's true. His careless driving was the of the accident. [     ]
A.
reason
B.
cause
C.
excuse
D.
answer
查看完整题目与答案
【单选题】The writer described Hamel as the best pilot but criticized his assistant for his carelessness in the flight.
A.
True
B.
False
C.
Not mentioned
查看完整题目与答案
【单选题】The deadly accident _____ his careless driving.
A.
resulted in
B.
resulted of
C.
resulted from
D.
led to
查看完整题目与答案
【简答题】A. from French for "wrong," a civil wrong or wrongful act, whether intentional or accidental, from which injury occurs to another. B. failure to exercise the care toward others which a reasonable or p...
查看完整题目与答案
【单选题】The only means to achieve success ___ to appeal to arms.
A.
is
B.
are
C.
were
D.
have
查看完整题目与答案
【单选题】Mr. Johnson ______ his boss ______ his careless mistake.
A.
apologized; about
B.
apologized to; about
C.
apologized to; for
D.
apologized; for
查看完整题目与答案
【单选题】下列各函数中,在(-∞,0)内为减函数的是?
A.
y=7x ＋ 2
B.
y=  -
C.
y = － x 2 ＋２
D.
y =2x 2 －１
查看完整题目与答案
【单选题】下列各函数中,在(- ∞,0)内为减函数的是
A.
y=7x+2
B.
y=-
C.
y=- +2
D.
y=2 - 1
查看完整题目与答案
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