China’s hi-tech trade surplus has lasted for______ so far.

China’s US $ 56.56 billion of imports and US $ 60.51 billion of exports of hi-tech products for the first 4 months of the year represent the country’s 7-month long trade surplus on hi-tech products since last October.
   The hi-tech foreign trade from January to April posted a year-on-year rise of 26.8 percent. The hi-tech exports went up faster than the imports by 12 percent. The hi-tech trade surplus totaled more than US $ 3.9 billion for the first 4 months.
   The hi-tech exports accounted for 27.8 percent of the total exports for the first 4 months.
   USS 35.38 billion, or 58.5 percent of hi-tech exports, came from integrated circuit, color TV, mobile phones, and automatic data processing equipment. They have won larger orders at higher prices.