下面的短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第1～4段每段选择1个最佳标题；(2)第27～30题要求从所的6个选项中为每个句子确定1个紧佳选项。 Icebergs 1 Icebergs are
among nature’s most spectacular (壮观的 ) creations, and yet most people have never
seen one. A vague air of mystery envelops them. They come into
being-somewhere-in faraway, frigid waters, amid thunderous noise and splashing
turbulence, which in most case no one hears or sees. They exist only a short
time and then slowly waste away (消融) just as unnoticed. 2
Objects of sheerest (最纯粹的) beauty they have been called. Appearing in an endless
variety of shapes, they may be dazzlingly white, or they may be glassy blue,
green or purple, tinted faintly or in darker hues. They are graceful, stately,
inspiring-in calm, sunlight seas. 3 But they are also called
frightening and dangerous, and that they are—in the night, in the fog, and in
storms. Even in clear weather one is wise to stay a safe distance away from
them. Most of their bulk is hidden below the water, so their underwater parts
may extend out far beyond the visible top. Also, they may roll over
unexpectedly, churning the waters around them. 4 Icebergs are
parts of glaciers that break off, drift into the water, float about awhile, and
finally melt. Icebergs afloat today are made of snowflakes that have fallen over
long ages of time. They embody snows that drifted down hundreds, or many
thousands, or in some cases maybe a million years ago. The snows fell in polar
regions and on cold mountains, where they melted only a little or not at aft,
and so collected to great depths over the years and centuries. As each year’s
snow accumulation lay on the surface, evaporation and melting caused the
snowflakes slowly to lose their feathery points and become tiny grains of ice.
When new snow fell on top of the old, it too turned to icy grains. So blankets
of snow and ice grains mounted layer upon layer and were of such great thickness
that the weight of the upper layers compressed the lower ones. With time and
pressure from above, the many small ice grains joined and changed to larger
crystals, and eventually the deeper crystals merged into a solid mass of
ice.
A. Formation of iceberg B. Iceberg is
beautiful C. Color’of iceberg D. Iceberg is
dangerous E. Iceberg is mysterious F.
Classification of iceberg Paragraph 1______.