Neither English nor Chinese ________ difficult to learn.
A、hasC
neither…nor…是固定搭配，意思是：既不……也不……。它需要遵循就近原则，谓语动词应与Chinese一致，所以答案是C。
In1995,anaverageof_______ofdomestictravelerswentonsightseeinginChina.
Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
Motivationandpersonalitymay________thevaryingdegreesofsuccessinone’scareer.
Themissingboyswerelastseen________neartheriver.
Motivation and personality may ________ the varying d egrees of success in one ’s career.
