1.I do not wish to ______ your sincerity.

　　A.reflect B.reflect on C.reflect in D.reflect about

　　2.The smog is due ______ invisible gases，mostly from automobile exhaust.

　　A.from B.to C.for D.with

　　3.______ is accepted as true is relatively，and not absolutely，true.

　　A.It B.That C.What D.That it

　　4.How can you keep the machine ______ when you‘re away?

　　A.run B.to run C.running D.being run外语学习网

　　5.Because of his degree，he refused to do ______ he thought“low”work.

　　A.that B.what C.which D.who

　　1.正确答案：B答案解析：reflect on：思索，思考，有时表示“怀疑”。根据句意，应该选reflect on.

　　2.正确答案：B答案解析：due to是固定搭配，意思是：归因于，由于。

　　3.正确答案：C答案解析：本句中，what is accepted as true是主语从句，在句子中作主语。

　　4.正确答案：C答案解析：keep sb doing sth：使某人持续做某事。

　　5.正确答案：B答案解析：what在本句中引导do的宾语从句。