The word shielding can be replaced by_
A.protecting
B.exploring
C.hiding
D.changing

Which is the correct order of plant succession in the example in the passage?
A.Weeds, shrubs, pines, oaks
B.Weeds, pine, shrubs, oaks
C.Oak, pines, shrubs, weeds
D.Shrubs, weeds, pines, oaks

The word originally is closest in meaning to
A.in the first place
B.specially
C.at the first source
D.for a short time

What is the best title of this passage?
A.The importance of weeds and grasses
B.How environmental habitats change
C.The success of oak and hickory
D.Animal and plant habitat

Read the following passage carefully and answer the questions, from questions 47 to questions 50.
Students working for their first degree at university are called undergraduates. Then they take their degree we say they graduate, and then they are called graduates. If they continue studying at university after they have graduated, they are called post-graduates. Full-time university students spend all their free time studying. They have no other employment. Their course usually lasts for three or four years. Medical students have to follow a course lasting for six or seven years. Then they graduate as doctors. In Britain, full-time university students have three terms of about ten weeks in each year. During these terms they go to lectures or they study by themselves. Many students become members of academic societies and sports clubs and take part in their activities. Between the university terms they have vacations (or holiday periods). Their vacations are long, but of course they can use them to study at home.
The phrase “by themselves” means ______.
A.on their own
B.lonely
C.alone
D.A&C

Read the following passage carefully and answer the questions, from questions 47 to questions 50.
Students working for their first degree at university are called undergraduates. Then they take their degree we say they graduate, and then they are called graduates. If they continue studying at university after they have graduated, they are called post-graduates. Full-time university students spend all their free time studying. They have no other employment. Their course usually lasts for three or four years. Medical students have to follow a course lasting for six or seven years. Then they graduate as doctors. In Britain, full-time university students have three terms of about ten weeks in each year. During these terms they go to lectures or they study by themselves. Many students become members of academic societies and sports clubs and take part in their activities. Between the university terms they have vacations (or holiday periods). Their vacations are long, but of course they can use them to study at home.
Students who continue studying at university after having graduated are called ________.
A.graduates
B.pre-graduates
C.undergraduates
D.post-graduates

Choose the correct words to fill in the following passage.
It is difficult to write rules that tell exactly when we should apologize, (41) ____ it is not difficult to learn how. If we have done something to hurt someone’s feelings, or if we have been (42) _____ or rude, we should apologize. An apology indicates that we realize we have (43) _____ a mistake, and we are sorry (44) _____ it. It is a way of expressing our regret for something. When we (45) _____, we admitted our wrongdoing, usually offer a reason for it, and (46) _____ regret.
(43)
A.produced
B.made
C.done
D.created

Choose the correct words to fill in the following passage.
It is difficult to write rules that tell exactly when we should apologize, (41) ____ it is not difficult to learn how. If we have done something to hurt someone’s feelings, or if we have been (42) _____ or rude, we should apologize. An apology indicates that we realize we have (43) _____ a mistake, and we are sorry (44) _____ it. It is a way of expressing our regret for something. When we (45) _____, we admitted our wrongdoing, usually offer a reason for it, and (46) _____ regret.
(45)
A.accept
B.admitted
C.laughed
D.apologize

Choose the correct words to fill in the following passage.
It is difficult to write rules that tell exactly when we should apologize, (41) ____ it is not difficult to learn how. If we have done something to hurt someone’s feelings, or if we have been (42) _____ or rude, we should apologize. An apology indicates that we realize we have (43) _____ a mistake, and we are sorry (44) _____ it. It is a way of expressing our regret for something. When we (45) _____, we admitted our wrongdoing, usually offer a reason for it, and (46) _____ regret.
(42)
A.friendly
B.kind
C.polite
D.impolite

Indicate an error in each of the following sentences.
When they came home, they didn’t buy nothing from the supermarket.
A.When
B.came
C.didn’t buy
D.from