The scientific research on how to protect the rare animals is ________. Many scientists are working hard to find new way to raise the animals by man.A.in dangerB.in controlC.in orderD.in progress
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D解析考查介词短语。in progress在进行中 in danger 处于危险之中 in order尽然有序 in control 在控制中根据意思，关于啊、保护稀有动物的科学研究正在进行之中。故选D。