计算：(-2)2+327-(3)2．

阅读理解。

     A study of English learning problems was carried out among a total of 106 foreign students. It shows

that most students considered understanding spoken English to be their biggest problem on arrival. This

was followed by speaking. Writing increased as a problem as students discovered difficultties in writing

papers that they were now expected to hand in. Reading remained as a significant (显著的) problem.

     The information gained helped us in determining where special attention should be paid in our course.

Although many students have chosen to join the course with a reasonable motivation (动机), we considered

it important to note what seemed to encourage interest. Nearly all the students have experienced some kind

of grammar-based English teaching in their own country. To use the same method would be self-defeating

because it might reduce motivation, especially if it has failed in the past. Therefore a different method may

help because it is different.

     Variety of activity was also seen as a way of maintaining (保持) or increasing motivation. Several years

ago we had one timetable that operated throughout, but we soon found that both the students and the teachers

lost interest by about halfway through the ten weeks. This led us to a major re-think, so finally we brought it

into line with the expressed language needs of the students.

1. What is the text mainly about?

A. Foreign students have more problems.

B. There are many ways to improve English.

C. Teaching should meet students' needs.

D. English learning problems should be studied again.

2. Writing became a bigger problem when foreign students _____.

A. had to write their papers

B. became better at speaking

C. became less interested in reading

D. had fewer problems with listening

3. We may infer from the last two paragraphs that _____.

A. different teaching methods should be used

B. grammar-based teaching seems to be encouraging

C. English courses are necessary for foreign students

D. teaching content should be changed halfway

4. The word "it" underlined in the last paragraph refers to "_____".

A. re-think

B. activity

C. motivation

D. timetable

若不断地升高温度，实现“雪花→水→水蒸气→氧气和氢气”的变化。在变化的各阶段被破坏的粒子间的相互作用依次是

A．氢键分子间作用力非极性键

B．氢键氢键极性键

C．氢键极性键分子间作用力

D．分子间作用力氢键非极性键

图示为修建高层建筑常用的塔式起重机．在起重机将质量m=5×10³kg的重物竖直吊起的过程中，重物由静止开始向上作匀加速直线运动，加速度a=0.2m/s²，当起重机输出功率达到其允许的最大值时，保持该功率直到重物做v_m=1.02m/s的匀速运动．取g=10m/s²，不计额外功．求：

（1）起重机允许输出的最大功率．

（2）重物做匀加速运动所经历的时间和起重机在第2秒末的输出功率．

银行《询证函》原则上不得由被审计单位即（）直接在银行办理。

A.上级领导

B.银行柜员

C.银行客户

D.审计单位

坏死细胞的细胞浆变化特征描述错误的是（）

A.线粒体肿胀、崩解

B.神经细胞的尼斯小体消失

C.内质网肿胀、崩解

D.横纹肌的横纹增加