[单项选择]Many apartments have doors with a security window so that one may ______ outside and observe visitors without being seen.
A. peer
B. peek
C. peel
D. pile

[单项选择]Many apartments have doors with a security window so that one may ________ outside and observe visitors without being seen.
A. peer
B. peek
C. peel
D. pile

[单项选择]Peter knocked on the doors of many houses because he liked to visit people.

[单项选择]Tom knocked on the doors of many houses because he liked to visit people.

[单项选择]Peter knocked on the doors of many houses to get some water.

[单项选择]As many have found to their ______ , ignoring interest rate, currency or commodity risks car, hurt a company just as badly as tbe failure of a new product.
A. feet
B. surprise
C. stand
D. cost

[单项选择]It has been proven that wooden doors have a ______ to expand in humid weather unless they are treated with a chemical stabilizer.
A. move
B. direction
C. tendency
D. desire

[单项选择]How many problems have remained unsolved


A. 4.
B. 14.
C. 18.
D. 25.

[单项选择]While many companies have their expansion stalled by lack of fund，this company is bucking the trend．


A. 尽管许多公司由于资金缺乏而停止扩建，但这家公司却逆势而上。
B. 尽管许多公司由于资金缺乏而停止扩建，但这家公司却反对这种倾向。
C. 当许多公司被资金缺乏而中断扩大时，这家公司却背道而驰；
D. 当许多公司的扩大被资金短缺所耽搁时，这家公司不合时宜。

[单项选择]Many scientists have been probing psychological problems.
A. solving
B. exploring
C. settling
D. handling

[单项选择]How many people have held a domonstration


A. About 2,000.
B. About 1,000.
C. Aborn3,000.
D. About4,000.

[单项选择]

Many people have difficulty in studying mathematics. Sometimes their difficulty (61) from the psychological idea that they are "no good (62) math". It has been demonstrated many times that it is often this idea (63) is causing their problems (64) than any lack of skill in mathematics. The (65) way to deal with this problem is to (66) yourself that math "involves using the same numbers you have been using (67) your life and that you know them as well as (68) else". Then set your mind to learning how they are used in the (69) part of mathematics you are studying.
Another problem many people (70) is that in mathematics, unlike some other (71) you may have studied, the material has a very important (72) or order. If you don’t understand a (73) of a mathematics text, it is no (74) going on to the next section. Many sections of math books are (75) o
A. good
B. use
C. help
D. doubt