托福考试

【单选题】
A、Current issues in economics
B．Choices faced by conservationists
C．
A、recent biology lecture
D．Topics for a research paper

网考网参考答案：B
网考网解析：
What are the speakers mainly discussing document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>