The Northern Pike is a very bad fish. It is a big, hungry fish, and eats little fish. Many Northern Pike live in Lake Davis. They are killing all the smaller fish in the lake. The Northern Pike area serious danger to the lake because they eat all the smaller fish. Soon, all other kinds of fish in the lake will be killed off. This is not healthy for the environment (环境).
Researchers are afraid that the Northern Pike will swim out of Lake Davis through many smaller rivers that feed into the lake. They could spread all over the country and damage many other water environments. If that happens, it would be too late to stop the Northern Pike.
For ten years, officials have been trying to remove the Northern Pike from Lake Davis. They have tried using nets and poisons (毒). However, the Northern Pike population is still doing well in Lake Davis. Many people do not like the idea of using poison to kill the fish. They worry that the poisons are bad for humans who use the wa
A. a short story
B. a news report
C. a research paper
D. an official announcement
The Northern Pike is a very bad fish. It is a big, hungry fish, and eats little fish. Many Northern Pike live in Lake Davis. They are killing all the smaller fish in the lake. The Northern Pike area serious danger to the lake because they eat all the smaller fish. Soon, all other kinds of fish in the lake will be killed off. This is not healthy for the environment (环境).
Researchers are afraid that the Northern Pike will swim out of Lake Davis through many smaller rivers that feed into the lake. They could spread all over the country and damage many other water environments. If that happens, it would be too late to stop the Northern Pike.
For ten years, officials have been trying to remove the Northern Pike from Lake Davis. They have tried using nets and poisons (毒). However, the Northern Pike population is still doing well in Lake Davis. Many people do not like the idea of using poison to kill the fish. They worry that the poisons are bad for humans who use the wa
A. They could be out of control.
B. The smaller fish would be saved.
C. The environment could be improved.
D. Many small rivers would be poisoned.
| The shopping centre is very big. There
are all kinds of things in it. Every day a lot of people, men and women, old and
young, go there to buy things. It opens at 8:00 in the morning and closes at
11:00 in the evening. This morning Tom is helping his mother buy things. He has a shopping list in his hand. They are looking for the things on the shopping list. After they stay in the shopping centre for about two hours, they get all the things that they need. |
The northern parts of the United States get very cold in the winter. It snows a great deal and the temperature often goes (21) zero degree in January, (22) and March. But the northeastern and northcentral regions of (23) have been financial and industrial centers, and they are heavily polluted.
In recent years, people in these regions have begun to take vacations (24) these cold winter months. They go to southern parts of the country (25) it is warmer. Many go to Florida where the weather is (26) . Others go to the western states of Arizona, New Mexico and Texas where they (27) dry desert climates.
I has become (28) nowadays for old people to move south to these places (29) they retire. Typically these people sell their houses in their home communities and move south to begin a new life (30) senior citizens.
Their children likely have homes (31) and many of th
A. when
B. where
C. unless
D. though
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