单项选择题

A．firs. B．metals. C．leaves. D．soils.In the Black Forest……

In sections A, B and C you will hear everything once only. Listen carefully and then answer the questions that follow.
SECTION A TALK
Questions 1 to 5 refer to the talk in this section. At the end of the talk you will be given 15 seconds to answer each of the following five questions. Now listen to the talk.

In the Black Forest, the acid rain is said to attack all EXCEPT（）

A．firs.
B．metals.
C．leaves.
D．soils.

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