例题讲解
1.Regular visits from a social worker can be of immense value to old people living alone.
A.equal B.immediate C.moderate D.great
D [解析]社会工作者对独居老人的定期访问很有价值。immense：巨大的，较好的;同义词和近义词包括great, enormous等;A.equal：平等的，用法为be equal to;B.immediate：立即的，直接的;例如：He demanded immediate payment.他要求立即付款。C.moderate：适度的，中等的;例如：It is a large house，but the garden is of moderate size.那是一栋大房子，可是花园却只有一般的大小。D.great：巨大的，符合题意，例如：He achieved great success in his career.他的事业取得了巨大的成功。
例如，With immense relief, I stopped running.
A. much B. enormous C. little D. extensive 本题选择B。
2.He was rather vague about the reasons why he never finished school.
A.bright B.unclear C.general D.bad
B [解析]他对自己没有完成学业的原因相当糊涂。vague：含糊的，不明确的，它和B.unclear意思相同，例如：It was still unclear what the cause of the aircrash was.那起空难的原因还不清楚。A.bright：聪明的，光明的;例如：We enjoyed the bright sunshine.我们享受明媚的阳光。C.general：一般的，大体的;例如：the general trend of development发展的大趋势。D.bad：糟糕的，坏的;You have to correct your bad habits radically.你必须彻底地改正自己的坏习惯。
例如 For some obscure reason, the simple game is becoming very popular.
A. unclear B. obvious C. major D. minor 本题选择A
Thick clouds obscured the stars from view.
A. darkened B. held C. blackened D. prevent
本题选择D。obscure 作为动词使用，意思是使得模糊不清;阻挡了的视线，所以选择D, prevent挡住。