同种生物的同一性状的不同表现形式称为相对性状．下列各组性状中_爱下问搜题

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问题选择题

同种生物的同一性状的不同表现形式称为相对性状．下列各组性状中不属于相对性状的是（　　）

A．茄的红果和白果

B．人的单眼皮和双眼皮

C．豌豆圆粒和皱粒

D．人的单眼皮和卷舌

答案

生物体的形态特征、生理特征和行为方式叫做性状，同种生物同一性状的不同表现形式叫做相对性状．

茄的红果和白果、人的单眼皮和双眼皮、豌豆圆粒和皱粒都是同种生物是同一性状的不同表现形式，因而都属于相对性状；

而人的单眼皮和卷舌不是同一性状，因而不属于相对性状，单眼皮和双眼皮、卷舌和不卷舌是相对性状．

故选：D

完形填空

The word “sharp” can be __ to describe many different things in your home, classroom, and places of work. In this chapter, the writer __sharp pencils, meaning pencils with a very fine __.The writer does not like dull pencils. 。
We can also use “sharp” to describe the blades of knives. Knives also have points. We can use “sharp” to describe a __ kind of point, such as the sharp points of kitchen and steak knives. Scissors have blades, too, and we can describe these blades as sharp or dull. Furthermore, the points of scissors are __ sharp or rounded spending on the kind of scissors. Some tools, such as saws, scrapers, and garden tools, also have blades. We can use the words “sharp” and “dull” to describe the blades of these tools, too. Sharp knives, scissors, and tools are__to use. They cut things easily and quickly, without effort.
“Sharp” can be used to describe the edges of furniture and __some containers. For example, the edge of a table or desk can be __.In addition; we can describe the edge of __ open can as sharp. The top of a can is sometimes sharp__ to cut your hand. A piece of __ from a broken jar or bottle is ordinarily very sharp.
__we sometimes use “sharp” to describe people. A person who appears sharp is very well __.A person who is sharp, on the other hand, is intelligent, smart, and__ learn and understand.
To summarize, “sharp” can be used to describe many kinds of __ that have blades, points, and edges. When we used it to describe people, it can mean nice looking, well dressed, or intelligent. It is an expensive word because it can be used in many different ways.

A．talks about

B．takes care of

C．doesn't like to mention

D．makes up his mind to

C．interesting

C．information

D．In this way

A．funny things

选择题

某学者认为：在抗日战争时期，蒋介石“主观上希望实行抗日、 * * 两个第一”’而实际上“实行的还是抗日第一， * * 第二”。该学者认为在抗日战争时期蒋介石[ ]

A．坚持抗战

B．消极抗日

C．改变 * * 立场

D．玩弄两面手法