题目内容：

简单的英语单选题D
31.[本题1分] Susan was determined to become a doctor and her persistence paid _______.
(A) for
(B) off
(C) back
(D) out
32.[本题1分] We couldn't afford _____ a new refrigerator.
(A) buying
(B) to buy
(C) bought
(D) buy
33.[本题1分] Fifty per cent of road accidents result ______head injuries.
(A) of
(B) in
(C) to
(D) from
34.[本题1分] A spokesman said:“We have no comment _______ the publication of these photographs.”
(A) to regard
(B) regarding
(C) regarded
(D) regard
35.[本题1分] Students can gain valuable experience by working ______ the campus radio or magazine.
(A) at
(B) in
(C) of
(D) on
36.[本题1分] Since then I've lived alone and immersed myself ______ my career.
(A) to
(B) in
(C) for
(D) at
37.[本题1分] He had no plans to retire _______he is now very comfortably off.
(A) when
(B) until
(C) because
(D) even though
38.[本题1分] Sunlight consists ______different wavelengths of radiation.
(A) in
(B) to
(C) of
(D) by
39.[本题1分] While a ______ amount of stress can be beneficial,too much stress can exhaust you.
(A) moderate
(B) modest
(C) modern
(D) moderation
40.[本题1分] He made no _______to hide his disappointment.
(A) afford
(B) effort
(C) effect
(D) affect