4.2NEWS 1

A、When there are more than 600 micrograms of dust per square meter of land.

B、When there are more than 800 micrograms of dust per square meter of land.

C、When there are more than 800 micrograms of dust per cubic meter of air.

D、When there are more than 600 micrograms of dust per cubic meter of air.

A、How to deal with sleep problems.

B、The way to identify and treat sleep disorders.

C、The effects of sleep loss and other sleep disorders.

D、The relationship between sleep disorders and productivity.

A、Because the workers visit doctors often.

B、Because the workers have sleep disorders.

C、Because the workers are too tired to handle their work.

D、Because the relationship between the boss and the workers is not good.

A、Because it loses healthful qualities.

B、Because it links to cancer.

C、Because it contains fat.

D、Because it causes obesity.

A、The risk of heart disease increases with the amount of meat a person eats.

B、The risk of heart disease decreases with the amount of meat a person eats.

C、The risk of cancer decreases with the amount of meat a person eats.

D、The risk of cancer increases with the amount of meat a person eats.

A、They take no notice of it.

B、They despise it.

C、They protest it.

D、They support it.

A、By 2013

B、By 2015

C、By 2050

D、By 2080

A、Land use,food security,job creation and sanitation.

B、Land use,food security,job creation and transportation.

C、Land use,food security,education and transportation.

D、Land use,food security,sanitation and transportation.

A、World technology.

B、World climate.D)

C、World peace.

D、World trade.

A、China

B、America

C、Japan

D、Germany