四六级考试

【单选题】
A、Because they’re too expensive.

B、Because they were the first kind of balloon ever useD、
C．Because they move very slowly.
D．Because they’re rejected by the pilots.
网考网参考答案：A
网考网解析：
[听力原文] Why are gas-filled models pretty uncommon nowadays 短文提到gas-filled models时说，充气热气球现在很少见是因为其极高的成本，短文中有明显的原因提示词because of，A项中的too expensive正好与短文中的extremely high cost对应，因此答案为A。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>