Amateur Astronomy

Many things have changed in astronomy over the past half-century. Until about 30 years ago, there was a great (1) .... of charts and catalogs. Telescopic equipment was limited and there were few books on practical astronomy. Today, the range of off-the-shelf telescopes and equipment covers almost everything one could need. Electronic calculators and computers have revolutionized almanacs and chart production, and (2) .... the analysis of observations and the publication of results.

All this must surely make this the golden (3) .... of amateur astronomy. Well, perhaps, but a great deal has been lost as well. Now one may have to travel 80 km to find a sky comparable to that found in urban areas 50 years ago. The daytime skies are now (4) .... by aircraft condensation trails which can (5) .... for hours and often spread out to form amorphous clouds, making solar observations impossible and (6) .... night-time observation too.

· For questions 1 - 6, read the three texts below and decide which answer (A, B, C, or D) best fits each gap.

Supermarket Opening

The opening of a new supermarket used to be a bit of an event in Britain. You could always rely on a soap star, a disc jockey, or a minor member of the royal family to come down and cut the ribbon. Now it seems that new branches are (1) .... up every day in many areas and so the poor old celebrity has become (2) .... . Why pay a famous person when any Tom, Dick or Harry will open it for nothing? Last week, waiting pensioners didn't care who opened the new branch of Superbuy, (3) .... they were at the front. According to one prospective customer who knew someone who worked there, the first five men over the (4) .... would be getting a bottle of aftershave, and the first five women, a bunch of flowers. This (5) .... of information quickly swept (6) .... the crowd, instilling feelings of smug superiority among those at the front, and envy from the latecomers.

1)  A. popping      B. leaping      C. jumping     D. nipping

2)  A. superfluous      B. excessive      C. surplus      D. residual

3)  A. despite      B. so long as      C. in case       D. regardless

4)  A. entrance     B. doorway     C. threshold      D. barrier

5)  A. clipping      B. strand      C. string      D. snippet

6)  A. among      B. through      C. across      D. around

How/are/old/?

this / my / phuonganh/ and / is / this / nga

Choose the item (A, B, C, or D) that best completes each of the following sentences.

The warm rain tumbled from the gutter in one of those midsummer downpours as I hastened across the lawn behind my house and took shelter in the pool. Breaststroking up and down, I nosed along with eyes just at water level. Each raindrop exploded in a momentary, bouncing fountain that turned into a bubble and burst. The best moments were when the storm intensified, drowning birdsong, and a haze rose off the water as though the pool itself were rising to meet the lowering sky.

It was at the height of this drenching in the summer of 1996 that the notion of a long swim through Britain began to form itself. I wanted to follow the rain on its meanderings about our land to rejoin the sea, to break out of the frustration of a lifetime doing lengths, of endlessly turning back on myself like a tiger pacing its cage.

Most of us live in a world where more and more places and things are signposted, labeled, and officially 'interpreted'. There is something about all this that is turning the reality of things into virtual reality. It is the reason why walking, cycling, and swimming will always be subversive activities. They allow us to regain a sense of what is old and wild, by getting off the beaten track and breaking free of the official version of things. A swimming journey would give me access to that part of our world which, like darkness, misty woods, or high mountains, still retains most mystery.

1, The incident in 1996 illustrates that, to the writer, rain is a symbol of  ____________

A.    repetitive cycles.

B.    enviable freedom.

C.    destroyed illusions.

D.   threatening power.

→ Explanation: ………………………………………………………………………………………………….

2, Why does the writer regard swimming as a 'subversive activity'?

A.  It involves no equipment or technology.

B.  It replicates an ancient skill.

C.  It allows direct contact with nature.

D.  It requires no official permission.

→ Explanation: ………………………………………………………………………………………………….

Choose the item (A, B, C or D) that best completes each of the following sentences.

                                                             SWIMMING

The warm rain tumbled from the gutter in one of those midsummer downpours as I hastened across the lawn behind my house and took shelter in the pool. Breaststroking up and down, I nosed along with eyes just at water level. Each raindrop exploded in a momentary, bouncing fountain that turned into a bubble and burst. The best moments were when the storm intensified, drowning birdsong, and a haze rose off the water as though the pool itself were rising to meet the lowering sky.

It was at the height of this drenching in the summer of 1996 that the notion of a long swim through Britain began to form itself. I wanted to follow the rain on its meanderings about our land to rejoin the sea, to break out of the frustration of a lifetime doing lengths, of endlessly turning back on myself like a tiger pacing its cage.

Most of us live in a world where more and more places and things are signposted, labeled, and officially 'interpreted'. There is something about all this that is turning the reality of things into virtual reality. It is the reason why walking, cycling, and swimming will always be subversive activities. They allow us to regain a sense of what is old and wild, by getting off the beaten track and breaking free of the official version of things. A swimming journey would give me access to that part of our world which, like darkness, misty woods, or high mountains, still retains most mystery.

1, The incident in 1996 illustrates that, to the writer, rain is a symbol of  ____________

A.    repetitive cycles.

B.    enviable freedom.

C.    destroyed illusions.

D.   threatening power.

→ Explanation: ………………………………………………………………………………………………….

2, Why does the writer regard swimming as a 'subversive activity'?

A.  It involves no equipment or technology.

B.  It replicates an ancient skill.

C.  It allows direct contact with nature.

D.  It requires no official permission.

→ Explanation: ………………………………………………………………………………………………….

→ Explaination: ………………………………………………………………………………………………….

2, Why does the writer regard swimming as a 'subversive activity'?

A.  It involves no equipment or technology.

B.  It replicates an ancient skill.

C.  It allows direct contact with nature.

D.  It requires no official permission.

→ Explaination: ………………………………………………………………………………………………….

1, Giải bài toán bằng cách lập pt dạng hoá học:

Một bình có 200g dung dịch chứa 10% muối. Cần bao nhiêu gam nước để được bình dung dịch chứa 4% muối. (hướng dẫn: khối lượng chất tan không thay đổi)

2, Hình học

Cho (O) và M nằm ngoài (O). Từ M vẽ 2 các tuyến M,A,B và M,C,D.

C/m: MA . MB = MC . MD