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【单选题】
下面对生态系统的叙述，不正确的是：A.
分解者对生态系统的物质循环起重要作用
B.
在稳定的生态系统中，各种生物的数量总是维持不变的
C.
植物作为生产者，参与了生态系统的物质循坏
D.
生态系统中，生产者、消费者、分解者缺一不可
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A.
One.
B.
Two.
C.
Three.
D.
Four.
【单选题】Section B Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and que...
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B.
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C.
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D.
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【单选题】-__________is it from your school to the zoo? -It's about six miles. [ ]
A.
How much
B.
How many
C.
How long
D.
How far
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【简答题】从需求的角度可以将市场分为( )市场、( )市场。
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