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【简答题】
动物在自然界中起着重要作用。请回答下列问题。 （1）蝗虫的天敌是蛇，麻雀，青蛙。如果人们随意捕杀这些动物，就容易引发蝗灾，这说明动物在维持_______________中起着重要作用。 （2）动物作为________者，直接或间接以植物为食，通过消化，吸收和代谢，排出了废物。可见动物能促进大自然的物质循环。
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举一反三
【单选题】Listen to the recording ( 1L04pB3T.mp3) and choose the right answer to the questions. What is the probable relationship between the two speakers?
A.
Two college students.
B.
Two college teachers.
C.
Doctor and patient
D.
Professor and student
【单选题】Now you will hear a short conversations.Listen carefully and choose the best answer from the four possible choices. u04_2.1_4.mp3:
A.
To visit a friend there.
B.
To build a statue for the US.
C.
To meet typical Americans.
D.
To view symbols of the US.
【简答题】mp3 Listen to the conversation between Josh and Amy. Then anser the following questions briefly.
【单选题】Now you will hear a short conversations.Listen carefully and choose the best answer from the four possible choices. u04_2.1_3.mp3:
A.
She thought the farmer in the painting was holding a tool.
B.
She thought the farmer in the painting had been to war.
C.
She thought the farmer in the painting was holding a weapon.
D.
She thought the farmer in the painting was using his tool as a weapon.
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