It was only after he had read the papers ________ Mr. Gross realized the task before him was extremely difficult to complete.
A:when
B:that
C:which
D:what
函数f(x)=cos(ωx+φ)的部分图像如图所示,则f(x)的单调递减区间为( )
— Which kind of program do you like better, science fictions or comedies?
— I prefer ______ comedies.
被人们誉为“一粒种子改变了世界”和“一个名字创造了1000亿元价值”的农业科学家袁隆平,2001年获得国家最高科学技术奖。袁隆平在杂交水稻研究上取得历史性突破,在于他敢于冲破经典遗传学的理论禁区。这给我们的启示是( )