Question 23 is based on the passage you have just heard.

Passage Three

听力原文

    In a recent study carried out by psychologists on the disruptive effects of smartphones, (22) [two groups of college students were given word search puzzles.] The first group was told to complete the puzzles with its participants’ smartphones in their line of sight. The second group, however, was told that the phones would interfere with equipment in the experiment and would need to be moved away from the testing area. Midway through the second groups solving of the puzzles, the experimenter called one of the phones, and let it ring for a while before hanging up. (23) [Many of the students in that group were unable to focus from then on, becoming anxious and performing more poorly than the first group.] 

    Use of electronics has also been known to lead to a decline in human interactions. Rather than having real-life conversations, many express emotions and engage in deep conversations through social media sites. Many students use their phones and computers during class for non-academic activities, which leads to poor grades. (24) [Perhaps the most dramatic impact is the reduction in the amount of sleep, which leads to poor health and weight gain.]

    (25) [Technology is a great tool. However, it’s important to recognize its downsides.] Lack of sleep, reduction of productivity and weight gain are only a few. If we are not careful about all these minor problems right now, the effect on the future generation is going to be much bigger.

23. What do we learn about many of the students in the second test group after the phone rang?

解析：A。录音中间指出，第二组的学生在电话响起之后便无法集中注意力，逐渐变得焦虑，测试的结果也比第一组更差。A项中的could no longer对应录音中的unable和from then on，concentrate对应录音中的focus，A项表示的意思与录音中提到的一致，故正确。

错项排除：B项中的until表明，铃声停止之后学生就能继续任务，而录音是说第二组学生从铃声响起以后就无法集中注意力了，并没有说他们在铃声停止后就能继续任务，故B项错误。录音没有提到回电话，故C项排除。录音中虽然提到了hanging up，但此处说的是实验人员故意让手机铃响一会之后挂断，这并非第二组学生的要求，故D项排除。