[单选题] You must always be on your ______ against violence.

1、[单选题]An economist is someone（ ）knows a lot about how goods and wealth are produced and used.

• A、which
• B、who
• C、what
• D、whom

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2、[单选题]The statue is as tall as a（　）building.

• A、seven-storey
• B、seven-storeys
• C、seven-stories
• D、seventh-story

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3、[单选题]Scientists have (  ) many new methods of increasing the world's food supply.

• A、put up with
• B、caught up with
• C、 brought up with
• D、come up with

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4、[单选题]The government of every country should (  ) great importance to environment protection.

• A、attach
• B、approach
• C、pay
• D、spend

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5、[单选题]The development of science and technology  _____ a change in our life.

• A、brought about
• B、brought up
• C、brought forward
• D、brought out

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