[单选题] Although he is considered a great writer，_____.

1、[单选题]When I try to understand ________ that prevents so many Americans from being as happy as one might expect,it seems to me that there are two causes.

• A、why it does
• B、what it does
• C、what it is
• D、why it is

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2、[单选题]The population of China is larger than ______ of Japan.

• A、one
• B、those
• C、that
• D、these

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3、[单选题]Although he knew little about the large amount of work done in the field,he succeeded ________ other more well-informed experimenters failed.

• A、which
• B、that
• C、what
• D、where

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4、[单选题]It is a pity that we should stay at home when we have ________ weather.

• A、so fine
• B、such a fine
• C、such fine
• D、so fine

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5、[单选题]Careful surveys have indicated that as many as 50 percent of patients do not take drugs ________ directed.

• A、like
• B、so
• C、which
• D、as

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