题目

阅读下面短文，掌握其大意，然后从各小题所给的四个选项中选出最佳选项。China is regarded as one of the safest places in the world for foreign visitors, according to an international security (安全) report. In the new Travel Risk Map 2018, China is listed as having a “1ow” travel risk, which______“violent crime rate is low. Many dangerous things that may happen in other______are uncommon in China”.The report, now in its eighth year, is shown and______by International SOS. China has become the fourth most______ country for tourists worldwide, with more th解分式方程：（1）xx+1+1=2x+1x；（2）1x+1-2xx2-1=1．