There is bad news for students who use their mobile phones in class. New research shows that students do not learn very well when they text and use social media in class. The research looks at the effects of texting and social media on student learning. Researchers looked at 145 American university students in the classroom. Some of the students used their mobile phones in class, while the others had their phones switched off. The students who did not use their mobile phones during the class got higher scores on tests they took at the end of the class. 

One of the biggest challenges teachers have in the classroom is the battle to keep students working. Many students feel they need to be online and checking messages, even when they had work to do in class. The researchers said it is common for students to be physically present in class, but mentally absent because they are using their mobiles. Many teachers are fighting a "losing battle" because students are more interested in social media than classwork. Research in England found that test scores went up by six per cent after mobile phones were banned in class.   

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1.The phrase “social media” refers to _____in the passage.

A computers

B mobile phones

C TV sets

D cameras

解析：选B。判断推理题。手机属于社交媒介，根据文章主旨可知，故选B。

2.The research is mainly on______.

A teachers in class

B students at home

C students in middle school

D students in university

解析：选D。细节理解题。根据第1段第4句Researchers looked at 145 American university students in the classroom.可知，故选D。

3.What’s the teachers’ biggest challenge in the classroom?

A To keep students working.

B To fight with students.

C To play games with students.

D To switch off all the students’ mobile phones.

解析：选A。细节理解题。根据第2段第1句One of the biggest challenges teachers have in the classroom is the battle to keep students working.可知，故选A。

4.What does the underlined word “mentally” mean in Chinese?

A 身体上地.

B 精神上地.

C 神经上得.

D 物理地.

解析：选B。语义猜测题。根据前文身体上出席可知下面为精神上缺席，故选B。

5.What’s the best title for the passage?

A A losing battle

B Teachers’ biggest challenge

C Social media’s bad effect

D Mobile phones low down students scores in class

解析：选D。主旨大意题。D项“课堂玩手机降低学生分数”契合文章内容，故选D。