第21题: [单项选择]In the field of biotechnology China is thought to ______. A. have been making an utmost effort learning from the West B. have become a country among the advanced C. have been able to rival the United States and Europe D. have launched a biotechnological revolution 参考答案:A 答案解析:从第二段第一句China is fast applying the latest life-science techniques learned from the West…可知A(一直在努力学习西方