听材料，回答问题。
（1）What problem were the farmers facing then？
A.The animals didn't have enough food.
B.Their grassland got much smaller.
C.It was too hot to grow crops.
（2）How did many experts feel about growing grass in Mauritania？
A.Supportive.
B.Concerned
C.Doubtful.
（3）What did Mr.Ren first do when he got to Mauritania？
A.He tried different types of waste.
B.He found the best watering way.
C.He improved the quality of the soil.
（4）How many types of plants did Mr.Ren try？
A.21.
B.12.
C.11.
【考点】听长对话．
【答案】见试题解答内容
【解答】
【点评】
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发布：2024/5/27 14:0:0组卷：0引用：1难度：0.0
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