设y=sin(cosα)cos(sinα)，且α为第二象限角，则y______0_爱下问搜题

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问题填空题

设y=

sin(cosα)

cos(sinα)

，且α为第二象限角，则y______0．（填≥、≤、＞、＜）

答案

∵α为第二象限角，∴0＜sinα＜1，-1＜cosα＜0．∴sin（cosα）＜0，且 cos（sinα）＞0，

∴y=

sin(cosα)

cos(sinα)

＜0，

故答案为：＜．

完形填空

The requirements for high school graduation have just changed in my community. As a result, all students must   36  sixty hours of service learning,   37  they will not receive a diploma（文凭）.    38   of service learning include cleaning up a polluted river, working in a soup kitchen, or tutoring a student. During a service experience, students must keep a journal and then write a  39  about what they have learned.
Supporters state that there are many   40 of service learning. Perhaps most importantly, students are forced to think   41 their own interests and become aware of the needs of others. Students are also able to learn real-life skills that   42 responsibility, problem-solving, and working as part of a team. Finally, students can explore possible careers 43  service learning.
For example, if a student wonders what teaching is like, he or she can choose to work in a primary school classroom a few afternoons each month. 44  there are many benefits, opponents （反对者） point out problems with the new requirement. First, they   45 that ,because service learning is time-consuming, students spend   46  time studying the core subjects. Second, they believe that forcing students to work without   47  goes against the law.
In my view, service learning is a great way to   48  to the community, learn new skills, and explore different careers. 49  , I don’ t believe you should force people to help others – the 50  to help must come from the heart. I think the best solution is one that gives students choices. Choice encourages both freedom and responsibility.

选择题

东南亚华人、华侨的祖先，主要来自我国（　　）

A．广东、福建

B．广东、海南

C．台湾、福建

D．海南、福建