单项选择题

A．He relaxes.
B．He goes to work.
C．He goes fishing.
D．He works at home. Questions 19 to 22 are based on the conversation you have just heard.
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单项选择题
Most rainforest soils are thin and poor because ________
A．the composition of the topsoil is rather unstable
B．black carbon is washed away by heavy rains
C．organic matter is quickly lost due to heat and rain
D．long-term farming has exhausted the ingredients essential to plant growth
单项选择题
According to the passage, people’’s learning activities are possible because they______.
A．believe that emotions are fundamental for them to stay alive
B．benefit from providing help and support to one another
C．enjoy being rewarded for doing the right thing
D．know what is vital to the progress of society
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