托福考试

【单选题】According to the professor, which of the following causes the evolution of a gas cloud into a star

A、The internal gravity of the clouD、
B、The thermal pressure of the clouD、
C、The interplay between the above two factors.
D、The lifetime of the gas clouD、
网考网参考答案：C
网考网解析：
[解析] 本题为细节题，考查考生对话语事实和细节的捕捉。题目问：根据教授的解释，什么是导致星云演化成恒星的原因 教授说：“The internal gravity of an interstellar gas cloud tends to make it shrink，and the thermal pressure tends to make it expand. (星云的内部重力致使星云收缩，而热力作用却使其膨胀。)”他还说：“It’s right a balance between these two actions, say, shrink and expand, that keeps the evolution of a gas cloud．(正是这两种作用之间的平衡，即收缩和膨胀的平衡，维持着星云的演化。)”根据这两句话，可以判断选项C为正确答案。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>