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 control C．in order D．in progress
D
考查介詞短語。in progress在進(jìn)行中 in danger 處于危險(xiǎn)之中  in order盡然有序 in control 在控制中根據(jù)意思，關(guān)于啊、保護(hù)稀有動(dòng)物的科學(xué)研究正在進(jìn)行之中。故選D。
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