依次填入下列句子横线处的词语，最恰当的一项是（2分）（  ▲  ）
①尽管官方对地铁坍塌事故尚未      具体原因，但各大媒体记者已经从采访中发现了蛛丝马迹。
②国务院对土地政策的调整，被有些房地产开发商      ，把它作为提高房价的冠冕堂皇的理由。
③学生在入境诵读中自会对文质兼美的语言文字      ，从而逐渐提高自己对语言文字的感受能力。
④扬州作为旅游城市，以其      的人文景观和绚丽的自然风光吸引着国内外游客。

根据所给情景完成下列对话，每空一词。

A: Hi! Jack. Do you want to (1) ____ English with me?

B: Yes, I (2) ____ .

A: What (3) ____do you often go to school?

B: I often go to school (4) ____  seven o'clock.

A: Oh, it's quite early. I get (5)____at seven. I often go to school at 7:30.

B: My home (6) ____  near the school. Do you have lunch (7) ____ home?

A: No, I (8) ____ . I have lunch at school. After lunch I play basketball (9) ____my friends.

B: Great! I like playing basketball, (10) ____ . But I play it at 4:30 in the afternoon.

下列省份与濒临的海的连线，正确的是（　　）

心脏内的瓣膜、静脉内的静脉瓣都能防止血液倒流（判断对错）

解不等式组： $\{\begin{array}{l}3x-2<4x-2\hfill \\ \frac{2}{3}x<7-\frac{1}{2}x\hfill \end{array}$