题目内容
（请给出正确答案）
A．by varying its chemical composition
B．by turning it into a solid lump
C．while keeping its structure unchanged
D．while retaining its liquid form
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Why is it easy to have credit-theft？
A．More people are using credit service.
B．The application program is not safe enough.
C．Creditors usually disclose their identity.
D．Creditors are not careful about their identity.
For parents who want to join their children in science experiment, they can
A．buy applications from the Kids Club.
B．answer questions about science on the website.
C．log on Science Zone in the website.
D．do the actual experiment with scientists at home.
A．Stores on the web.
B．Large commercial web sites.
C．Small commercial web sites.
D．Public government web sites.
Drawer Commercial invoice Packing list Bill of exchange Customs invoice
Commercial companies______millions of dollars each year for the government.
A．take away
B．bring in
C．bring out
D．lose
