题目内容
（请给出正确答案）
A.against
B.under
C.in
D.beneath
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更多“The pine trees were black _______ the morning sky.”相关的问题
A、Pine, bamboo and plum trees
B、Plum, bamboo and willow trees
C、Willow, bamboo and Chinese parasol trees
D、Pine, plum and maple trees
There used to be some trees by the lake, ____________？
A、was there
B、were there
C、weren't there
D、wasn't there
Pine trees are usually believed to _______ cold weather.
A.guard
B.accomplish
C.roar
D.endure
What does the author think about the genetic engineering of pine trees？
A．Time-consuming.
B．Worthwhile.
C．Significant.
D．Technically impossible.
Certain pine trees are deliberately dwarfed for______ purposes.
A．constructive
B．dimensions
C．ornamental
D．decorated
When the Dutch first sailed up the Hudson River 300 years ago, they discovered black walnut trees so large that the first branch was as much as 70 feet above the ground. In colonial times the black walnut became one of America's first exports, because it was highly prized by cabinetmakers. During World War I almost all natural woods of the black walnut were eliminated. Trees were harvested for gun stocks, and even the nutshells were collected to use as filtering material in gas masks.
Today, growing black walnut trees is profitable because of the demand for it. However, not every black walnut tree is necessarily valuable. It must be inspected to see if it meets certain standards. Furthermore, the roots of the black walnut tree produce a poisonous substance that will cause harm to tomatoes, potatoes, blackberries and apples.
Why is the black walnut tree so valuable7
A．Because of its hardwood and its beauty.
B．Because of its historic value.
C．Because of its great age.
D．Because of its great size.
A．require
B．requires
C．is required
D．that requires
A、The reason why most of the country shifts to daylight savings time is that winter days are much shorter than summer days.
B、There were pine trees that stood like giants.
C、The intention of the company was to expant its workforce.
D、The company proposed to diversify the background and abilities of employees.
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