The population is 3.8 million, of which about 1.5 million live in San Juan, although
aboutanother two million Puerto Ricans live in the USA. The average life is 73.8 years and
GDP per person is US$12, 212, the highest in Latin America, although not up to the level
of mainland USA. The people are largely a mixture of Amerindian, Taino-Arawak, Spanish
and African. Most Puerto Ricans do not speak English and less than 30% speak it well. The
people are very friendly and hospitable but there is law-breaking action, linked to drugs
and unemployment.
56. It can be learned from the passage that _____.
A. Puerto Rico belongs to the USA
B. Puerto Rico is part of Spain
C. Puerto Rico is an independent country
D. Puerto Rico has the highest peak in Latin America
57. The underlined word “hospitable” in the last sentence means “_____”.
A. impolite to visitors B. friendly and welcoming to visitors
C. tired of visitors D. impatient to a patient
58. What’s the character of Puerto Rico?
A. Either new or old. B. A mixture of different peoples.
C. Too many fast food restaurants. D. Either Spanish or American.
59. According to the passage, old volcanic mountains lie _____.
A. in the center of the country B. on a coastal plain
C. near the Cordillera Central D. in the north of the country
B
Although men and women have been growing crops for thousands of years,they have not alway
s had enough to eat. Even today, many people in the world go hungry, and even die of hunger.
Ifwe are to grow enough for everybody, we have to grow more crops and better crops.
Plants need the right food in order to grow. In particular, they need three chemical substanc
es(物质) in the soil: nitrogen(氮), phosphorus(磷) and potassium(钾).They also need smaller
amounts of other chemical substances like calcium.If there is too little of any of these
substances in the soil, plants can’t grow well.
When a plant grows, it takes up these basic substances from the soil and builds them into
itself. If we remove the plant from the soil and use it for food, we are taking some of these
substances away, and this means that future plants will find less of them in the soil. In
time,the soil would become too poor for plants to grow in it at all.
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