Conversation so far:
what country has the highest gross domestic product
The United States has the highest GDP of all developed countries.
what is the gdp of the country usa
USA's GDP is $21,439,453 million
what is the country with the second highest gdp
China has the second highest GDP.
what is china's biggest export
Machines such as computers, broadcasting equipment and telephones make up the bulk of Chinese exports.

Question: how about import
Self-contained rewrite: what is china's biggest import