[填空题]

Water is the most common substance on earth. It covors more than 70 per cent of the earth’s
surface. It fills the oceans, rivers, and lakes, and is in the ground and in the air we breathe. Water is everywhere. Without water, there can be no life. In fact, every living thing consists mostly 0f water. 41)______
42)______ . Rain hammers at the land and washes soil into rivers. The oceans pound against the shores, chiseling cliffs and carrying away land. Rivers knife through rock, carve, canyons, and build up land where they empty into the sea. Glaciers plow valleys and cut down mountains.
43)______ . Land absorbs and releases heat from the sun quickly. But the oceans absorb and release the sun’s heat slowly. So breezes from the oceans bring warmth to the land in winter and coolness in summer.
Throughout history, water has been people’s slave and their master. Great civilizations have risen where water supplies were plentiful. They ha

[填空题]

Water is the most common substance on earth. It covors more than 70 per cent of the earth’s
surface. It fills the oceans, rivers, and lakes, and is in the ground and in the air we breathe. Water is everywhere. Without water, there can be no life. In fact, every living thing consists mostly 0f water. 41)______
42)______ . Rain hammers at the land and washes soil into rivers. The oceans pound against the shores, chiseling cliffs and carrying away land. Rivers knife through rock, carve, canyons, and build up land where they empty into the sea. Glaciers plow valleys and cut down mountains.
43)______ . Land absorbs and releases heat from the sun quickly. But the oceans absorb and release the sun’s heat slowly. So breezes from the oceans bring warmth to the land in winter and coolness in summer.
Throughout history, water has been people’s slave and their master. Great civilizations have risen where water supplies were plentiful. They ha

[单项选择]Mountain Climbing, ascending mountains, is most commonly taken as a recreational activity. Mountain climbing is popular worldwide, wherever hills rise high enough to provide challenge. The activity’s rewards include the physical exertion it requires, the satisfaction of overcoming difficulties by working with others, the thrill of reaching a summit, and the unobstructed view from a mountaintop. Exploration and research are other reasons that people climb mountains.
Ascents can be either non-technical (a hike up a path or a scramble over rocks, not requiring the safety of a rope), or technical (a climb up more difficult terrain that requires the use of rope and other specialized equipment). This article focuses on technical climbs, which involve all the elements of simple hikes but also require advanced knowledge and equipment. Making technical climbs is also known as mountaineering.
Since ancient times, people have viewed mountain peaks as towering objects of myth, spiritual
A. The happiness of reaching a mountaintop.
B. The beautiful view in a mountain.
C. The unobstructed scenery from a summit.
D. The satisfaction of conquering difficulties with others.

[判断题]Water is a kind of chemical substance.

[单项选择]Salt is a substance that （　） in water.
A. dissolve easy
B. dissolve easily
C. dissolving very easy
D. dissolves easily

[填空题]
What are the most common animal bites from They are from ______.

[填空题]The substance does not dissolve in water ______ (不管是否加热)。

[填空题]The substance does not dissolve in water _____________________________ (不管是否加热)。