8．When he was at university，he majored in ________(工程学)．

7．November is a month which has many ________(多雾的)days.

6．There are plans to widen the ________(最狭窄的)sections of the road.

5．Professor Smith is busy doing h________ research.

4．The 20­kilometre­long subway is so far Guangzhou’s largest c________ project.

3．Many great people，such as Sun Yet­sen and Mao Zedong，were once active in the south，leaving behind many historical s________.

2．They will do their best to g________ more energy from the wind and sun.

1．Burning coal has led to g________ warming.

7．判断y=－Asin(ωx+)(ω＞0)的单调区间，只需求y=Asin(ωx+)的相反区间即可，一般常用数形结合而求y=Asin(－ωx+)(－ω＜0＝单调区间时，则需要先将x的系数变为正的，再设法求之

6．函数的单调性是在定义域或定义域的某个子区间上考虑的，要比较两三角函数值的大小一般先将它们化归为同一单调区间的同名函数再由该函数的单调性来比较大小。