绝对值小于3的所有整数的和是
0
解：绝对值小于3的整数有0、、，和是
坚持和发展毛 * * 思想，首先要做到完整地、准确地理解和掌握毛 * * 思想科学体系。 ( )
They had a good preparation (准备) for the project, so they had little ____ all the work. [ ]
A. troubles to finish
B. trouble to finish
C. difficulty in finishing
D. difficulties to finish
、
，和是
、，和是