[单项选择]We were delighted to find the trees planted a year before ______ very tall.


A. growing
B. being grown
C. having been growing
D. grown

[单项选择]We were delighted to find the trees planted a year before ______ very tall.


A. growing
B. being grown
C. having been growing
D. grown

[单项选择]The first trees were like modern trees in most ways except that ______.


A. they do not have branches
B. they do not have flowers
C. they do not have seeds
D. they do not need sunlight

[单项选择]

If we were asked exactly what we were doing a year ago, we should probably have to say that we could not remember. But if we had kept a book and had written in it an account of what we did each day, we should be able to give an answer to the question. It is the same in history. Many things have been forgotten because we do not have any written account of them. Sometimes men did keep a record of the most important happenings in their country, but often it was destroyed by fire or in a war. Sometimes there was never any written record at all because the people of that time and place did not know how to write. For example, we know a good deal about the people who lived in China 4 000 years ago, because they could write and leave written records for those who lived after them. But we know almost nothing about the people who lived even 200 years ago in central Africa, because they had not learned to wrtie.
Sometimes, of course, even if the people cannot write, they may know so
A. it is written down
B. no written account is available
C. it proves to be true
D. people are interested in it

[单项选择]According to the passage, trees were initially needed by the Nebraskan settlers for ______.


A. shade
B. the prevention of soil erosion
C. the creation of parks
D. construction

[单项选择]It was a freezing winter. The trees were （） and the branches were still.
A. bare
B. empty
C. vacant
D. blank

[单项选择]______ that many of the big trees were damaged.
A. The storm was such severe
B. So severe was the storm
C. So the storm was severe
D. Such was the storm severe

[单项选择]What happens to trees each year


A. Their tings get thinner and thinner.
B. They add a ring of wood.
C. Their rings get darker in color.
D. They become more valuable.

[单项选择]______ the ninety films produced last year were well received by the people in this country.


A. In large
B. By and large
C. With large
D. At large

[单项选择]We were told that we should follow the main road ______ we reached the central railway station.


A. whenever
B. until
C. while
D. wherever