问题 选择题

一棵幼小的植株是由种子的哪个结构发育而来的(  )

A.胚芽

B.胚轴

C.胚根

D.胚

答案

在一个完整种子中,种皮具有保护作用,胚是种子的重要部分,包括胚芽将来发育成茎和叶,胚轴将来发育成连接茎与根的部分,胚根将来发育成根,子叶具有储存或转运营养物质的作用.由此看出种子中的胚将来发育成新的植物体,所以一棵幼小的植株是由种子的胚发育而来的.

故选:D.

阅读理解
C
Honey Sweet Cake (Prep. Time: 12 mins.)
Ingredients
Strawberries in syrup(糖浆), 1 package (unfrozen)
Heavy cream, 1 cup
Corn flour, 2 tablespoons
Process
Mix the strawberries, cream and corn flour in a saucepan. Cook over medium heat for about 8-10 minutes, while constantly mixing until the mixture thickens.
Remove from heat and refrigerate for two hours, Fill the frozen mixture in a cake, and serve.
Rosy Cake (Prep. Time: 10 mins. )
Ingredients
Sugar, 3/4 cup
Water, 1 cup
Corn flour, 3 tablespoons
Strawberries , 2——3 cups
Process
Take a large saucepan and mix all the ingredients. Cook until the mixture thickens over medium heat. Let it cool naturally and completely. Fill up your cake with the mixture, and serve.
Triangle Sweet (Prep. Time: 15 mins. )
Ingredients
Sugar, cup
Whipping cream, cup
Unflavored gelatin(明胶) , 1 tablespoon
Cold water, 2 tablespoons
Boiled water, 3 tablespoons
Strawberries, crushed, 2 cups
Process
Add sugar to the crushed strawberries and set them aside. In cold water, soften the gelatin, and once it is softened, add boiling water. Stir until the gelatin dissolves. Add the dissolved gelatin mixture to the strawberries and let it cool. Now whip(搅打) the cream till it becomes stiff. When the strawberry mixture is of syrup thickness, add the whipped cream to it. Refrigerate until it sets. Fill it into your cake, and serve.
Flaming Maple (Prep. Time: 10 mins. )
Ingredients
Fresh lemon juice, 1 tablespoons
Honey, 2 tablespoons
Maple syrup, 2 tablespoons
Strawberries, ripe, 2 pints
Process
Make a fruit butter of half of the strawberries. Add honey, lemon juice, and maple syrup until it forms a smooth sauce. Add the remaining strawberries. Fill the mixture in the cake, and serve.
小题1:Which of the following ingredients are used in all the recipes?
A.heavy creamB.sugar syrupC.corn flourD.strawberries
小题2:Chefs needn't freeze the ingredients when preparing ___________
① Honey Sweet Cake ②Rosy Cake ③Triangle Sweet   ④ Flaming Maple
A.①②B.②③C.①④D.②④
小题3:Which of the following is true?
A.Triangle Sweet takes the longest time to prepare.
B.Strawberries used in the recipes aren't all fresh.
C.Most strawberries are used when making a Rosy Cake.
D.Honey Sweet Cake is the best choice for busy mothers.
小题4:In how many recipes should chefs thicken the mixture by heating?
A.Only oneB.Two.C.Three. D.Four.
名词解释