Read the sections 4.1 to 4.3 of the paper. What is the function of 4.3？

A．all over the floor

B．out of the door

C．out of the open window

  The author of the paper believe that first-generation students___

[A] are actually indifferent to the achievement gap

[B] can have a potential influence on other students

[C] may lack opportunities to apply for research projects

[D] are inexperienced in handling their issues at college

   本题为单选题，请选出正确答案，谢谢！

A．the headlines

B．the sports page

C．the front page

D．the classified advertisements

A.20

B.16

C.12

D.8

E.4

A、Promising laboratory test results still need to be confirmed by clinical studies before clinical recommendation could be given.

B、It really is still a significant problem in dentistry to bond reliably to oxide ceramics such as alumina and zirconia ceramics.

C、Most original laboratory research reports on bonding to zirconia ceramics start in their introduction with a statement pointing more or less out that achieving a reliable and predictable bond to this ceramic would be a major problem in dentistry.

D、No clinical trials with alumina ceramic IRFDFs or with RBFDPs made from densely sintered alumina ceramic were found.

A．An advertisement in the paper.

B．The details of a possible job.

C．A small firm of consultant engineers.

D．An interview for waitress job.

A．the lack of experienced researchers

B．lack of access to southern China

C．lack of relevant rock samples

D．lack of well-preserved fossils