近几年来，两岸关系发生了可喜的变化：实现“大三通”、共同抗议外国对中国领土主权的侵犯、共同应对自然灾害、国共两党高层持续良性互动、通过《海峡两岸经济合作框架协议》、2008～2012年两岸贸易总额达5542．7亿元等。这些变化充分说明海峡两岸（    ）

阅读下面短文, 按照句子结构的语法性和上下文连贯的要求, 在空格处填人一个适当的词或使用括号中词语的正确形式填空。

    Some people prefer to make friends with people who are very much like them while others prefer friends who are very different. There are advantages of both types of ____ (friend). If a man ____ (choose) a friend similar to himself, there is no problem that they will share many common interests. They may have similar goals in life. This means that they will be able ____ (help) each other in achieving their goals. Two people who are very similar will feel ____ (comfort) with each other and may understand each other's feelings better. ____ (they) friendship may be deeper and last longer.

    There are also many advantages of ____ (make) friends with someone of opposite interests and even character. In this type of friendship, the two people complement(补充) each other. If one is weak in some ways, ____ other is strong. Two people ____ similar goals may find themselves in competition, ____ those who want different things can always support each other. Those who have different interests can ____ (introduction) each other to new experience and so enrich(丰富) their knowledge.

    A friend who is unlike me may be challenging, but a similar friend is familiar and safe.

方框中所给单词的适当形式填空，使对话通顺、正确。每词仅用一次（每空一词）。

Sandy: Mom, I'm really worried.

Mom: Why? What's the ____?

Sandy: I can't find my schoolbag.

Mom: Well, where did you last put it?

Sandy: I can't remember! I ____ a concert yesterday so it might still be in the museum hall.

Mom: Do you have anything ____ in your schoolbag?

Sandy: No, just my books, my pink hair band and some tennis balls.

Mom: So it can't be ____.

Sandy: Oh, wait! I went to a picnic after the concert. I remember I had my schoolbag with me at the picnic.

Mom: So could it still be at the park?

Sandy: Yes. I left early, before the rest of my ____. I'll call them now to check if anybody has it.

下列关于生态工程的叙述，错误的是（　　）

有下列命题：
①设集合M = {x | 0< x ≤3},N = {x | 0< x ≤2},则“a∈M”是“a∈N”的充分而不必要条件；
②命题“若a∈M，则$b\notin M$”的逆否命题是：若$b\in M$则$a\notin M$；
③若$p\wedge q$是假命题，则p,q都是假命题；
④命题P：“$\exists x_0\in R,{x_0}^2-x_0-1>0$”的否定$\neg p:\forall x\in R,x^2-x-1\le 0$
则上述命题中为真命题的是（   )