托福考试

【单选题】
A、By flying in circles around a field
B、By detecting a chemical signalC、By inspecting individual corn leaves
D、By noticing the caterpillar’s coloration
网考网参考答案：B
网考网解析：
[听力原文] How can a wasp find a caterpillar on a corn plant document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>