Nearly 610,000 Chinese students attended schools and colleges overseas in 2017. China remains the world's ____ (large) supplier of international students. A majority____the students went to European and North American countries. Countries____ (include) in the Belt and Road Initiative (B&R) became new destinations, with student numbers ____ (rise) by 15.7 percent in 2017. At the same time, about 480,000 graduates returned to China. Since 1978, about 5.2 million Chinese____ (study) abroad and among those ____ graduated about 83.7 percent returned to China.

    Meanwhile, a total of 490,000____ (foreign) from 204 countries and regions studied in China is 2017. Students from the Republic of Korea, Thailand and Pakistan were the most numerous, while the United States ranked ____ (four). Students from B&R countries accounted for 64.9 percent of____ total. About 59,000 international students in China ____(support) by Chinese government scholarships.

神经系统是由____ 、____ 和____ 组成的。

把一颗骰子投掷两次，第一次出现的点数记为m，第二次出现的点数记为n，方程组$\left\{\begin{array}{c}mx+ny=3\\ 2x+3y=2\end{array}\right.$只有一组解的概率是(      )