[单选题] Some 1.3 million firms have opened their doors over the past four years of economic growth. ( )

1、[单选题]Hardly had they arrived at the airport ___the plane started to leave.（）

• A、than
• B、then
• C、until
• D、when

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2、[单选题]We were overjoyed at the news of China _______ another man-made satel1ite.

• A、start ing
• B、1a un chi ng
• C、fighti ng
• D、shouti ng

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3、[单选题]There is a computer system _____he company is experiencing problems.

• A、with which
• B、as which
• C、such as
• D、for such

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4、[单选题]Which is more important , the ________ appearanee of a book or its content?

• A、artificial
• B、 surface
• C、 physical
• D、 substa nee

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5、[单选题]Readers can _______ quite well without knowing the exact meaning of each wor（）

• A、get over
• B、get in
• C、get along
• D、get through

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