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EXERCISE_Finding the Topic Sentence of a Paragraph The following paragraph contains a topic sentence that states the main idea of the paragraph. Choose the sentence that best states the main idea. Many people go to the grocery store without much thought. Once there, they become victims to clever product placement. In order to shop wisely, several basic rules should be kept in mind. First, the wise shopper should make a list. This will keep a focus on the person’s needs, not wants. Grocery stores purposely place tempting items such as candy and magazines near the checkout counters; these are things that are not basic needs on anyone’s list. A person who sticks to the list will save a substantial amount of money within a few months. Secondly, the shopper should avoid delis and convenience stores where the markups tend to be higher than in the large grocery chains. Next, buying store brands can result in big savings. In many cases, these store brands are of the same quality as the higher priced brands. Of course, we all know we should clip coupons, but be careful not to buy items that are not really necessary . Sometimes a store brand is still cheaper than the more expensive item even after the coupon amount has been deducted. Some people claim they can save by buying in bulk. They might buy a bushel of apples or 40 pounds of potatoes. However, if the food spoils before you can eat it, this may be a big mistake. It is true that a bargain is not always a bargain.
A.
Many people go to the grocery store without much thought.
B.
Once there, they become victims to clever product placement.
C.
In order to shop wisely, several basic rules should be kept in mind.
D.
It is true that a bargain is not always a bargain.
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【单选题】“科学”追溯渊源,它的意思是()
A.
智慧
B.
知识
C.
自然
D.
聪明
【单选题】我们在吃熟玉米时,常会掉下一些发白的“小东西”,其实那是玉米种子的胚,若只将生玉米种子的胚种下去则不能萌发,原因是(  )
A.
胚不完整
B.
胚已死
C.
无供胚发育的营养物质
D.
在休眠期内
【单选题】右图是玉米种子纵切示意图,能为玉米种子萌发提供所需营养物质的结构是
A.
B.
C.
D.
【简答题】玉米()片叶时是玉米需肥量最大的时期,也是玉米追肥的最佳时期。
【简答题】油菜和玉米是都我市重要的经济作物。图一和图二分别是油菜花和果实结构图,图三是玉米种子及其萌发过程示意图。请分析回答:(6分) 图一             图二                   图三 (1)“儿童急走追黄蝶,飞入菜花无处寻”,这说明生物与环境的关系是 。 (2)图二是由图一的 (填数字序号)发育而成的。 (3)图三中,玉米种子萌发时所需营养物质由 (填数字序号)提供。发育成玉米...
【单选题】What did Selous do with regard to the development pf Zimbabwe's gold industry?
A.
He opened it up.
B.
He took records of it.
C.
He provided instruments for it.
D.
He negotiated with local leaders about it.
【单选题】如图为菜豆种子和玉米种子的结构,根据图示下列哪一项叙述是正确的?(  )
A.
甲是玉米种子结构图,将浸泡好的玉米种子从中间纵向切开,然后在剖面上滴上一滴碘液,观察发现被染成蓝色的部位是结构4
B.
乙是菜豆种子结构图,种子萌发时最先突破种皮的是结构2
C.
菜豆和玉米种子中结构1、2、3构成胚,胚是新一代植物体的幼体
D.
菜豆种子中结构6是种皮,玉米种子中结构6是果皮和种皮
【简答题】某粮食专业户去年收的小麦是玉米的3倍,小麦比玉米多收9吨.去年收小麦和玉米各多少吨?(用方程解)
【单选题】种植玉米时,要用农药拌种以防止害虫啃咬种子,但农药并不会进入玉米种子的细胞内,原因是玉米种子的细胞具有
A.
细胞壁
B.
细胞膜
C.
细胞质
D.
细胞核
【单选题】图是玉米种子纵切图,能为玉米种子萌发提供营养的结构是
A.
B.
C.
D.
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