Question

托福阅读这一题的b选项有什么问题？

Paragraph 5: In experimenting with artificial suns,
Kramer made another interesting discovery. If the artificial Sun remained
stationary, the birds would shift their direction with respect to it at a rate
of about 15 degrees per hour, the Sun's rate of movement across the sky.
Apparently, the birds were assuming that the "Sun" they saw was
moving at that rate. When the real Sun was visible, however, the birds
maintained a constant direction as it moved across the sky. In other words,
they were able to compensate for the Sun's movement. This meant that some sort
of biological clock was operating-and a very precise clock at that.

8. According to paragraph 5, how did the birds fly whenthe real Sun was visible?（1）
○They kept the direction of their flight constant.
○They changed the direction of their flight at a rate of 15degrees per hour.
○ Theykept flying toward the Sun.
○They flew in the same direction as the birds that wereseeing the artificial Sun.

Answer 1

b选项They changed the direction of their flight at a rate of 15degrees per hour

是说小鸟以每小时15度角的速率改变方向。
而文中提到When the real Sun was visible，however, the birds
maintained a constant direction as it moved across the sky.
constant direction保持恒定的方向，说明小鸟的方向是不变的（在真的太阳可见的情况之下）