硅胶适合碱性成分的分离，氧化铝则适合酸性成分的分离。_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题判断题

硅胶适合碱性成分的分离，氧化铝则适合酸性成分的分离。

答案

参考答案：错

单项选择题

Speaker A: Do you mind if I change the channel
Speaker B: ().

A. Actually, I think this program is quite interesting.

B. Yes, you can switch to the channel you want to watch.

C. Never mind. Just go ahead.

D. Certainly. You can do what you like.

填空题

Press Photographers

Good press photographers must have an "eye" for news, (26) journalists must have a "nose" for a good story. They must be able to interpret a story and decide rapidly how they can take (27) of the best opportunities to take pictures. The most difficult part of a press photographer’s job is that he or she has to be able to (28) a complicated situation with just one photograph. They rarely have second (29) and must be able to take the required (30) very quickly. Indeed, speed is essential — if the photographs are not (31) for the printing deadline, they are very unlikely to be of any (32) .
Most press photographers begin (33) with a local newspaper. There, the (34) is mostly for material of regional interest. Photographers may be expected to photograph a lot of unexciting events but to (35) the enthusiasm to put "something special" into every picture.
There is (36) competition among those who want to move from local to national newspapers. Here, the work is much more centered on news. The photographer must work (37) greater pressure and (38) more responsibility. Only (39) reliable, talented and resourceful photographers (40) this difficult move. The work is tough and can be (41) . On an overseas assignment, photographers may have to (42) unfamiliar food and accommodation, physical and mental stress, and (43) difficulty in transporting the pictures from an isolated area to get them to the newspaper (44) They also have to (45) the competition from other publications.

A. firmB. forceful C. strict D. p