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【单选题】

请根据下面短文回答:
Farming is a job that requires hard work every day. In spring farmers must plant their fields. Many farmers grow crops(农作物)and some grow vegetables. Some also grow different types of fruit. Other farmers keep animals for meat and for other foods such as milk, or eggs.
In summer farmers must care for the plants in their fields: they must water the plants and be careful that no birds or animals hurt them. They must also be careful if it gets too cold at night.
Fall is a very busy time for farmers. They have to cut their crops and vegetables. In fall farmers also have to clear the fields for spring planting.
Every day in spring, summer, and fall farmers must take their cows or sheep to the fields to eat the grass. Every evening they must bring them back. In winter the animals don’t often go to the fields.
Winter is not usually as busy for the farmers, but like any other day of the year, they must feed the animals and get the eggs from the chickens. In the evenings they must milk the cows. They must also send food to the stores or other companies to sell.
What must farmers do in spring

A.
Grow vegetables.
B.
Plant their fields.
C.
Feed animals.
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题目标签:根据农作物作物
参考答案:
参考解析:
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【单选题】图5-6为影响农作物生产因素示意图,正确的是( ) 图5-6

A.
①花生②水稻③蔬菜④冬小麦
B.
①甘蔗②棉花③花卉④甜菜
C.
①油菜②花卉③水果④棉花
D.
①棉花②桑树③亚麻④冬小麦

【多选题】根据我国《合同法》的规定,在( )情形下,要约失效。

A.
拒绝邀约的通知到达要约人。
B.
要约人依法撤销要约。
C.
承诺期限届满,受要约人未作出承诺。
D.
受要约人对要约的内容作出实质性变更
E.
要约人依法撤回要约

【单选题】通过哪种方式可以减少金属镉向农作物的转移

A.
加入石灰使pH增加,使其转化成难溶盐
B.
加入Ca(OCl)Cl使pH增加,转化成难溶盐
C.
加入硅酸使pH降低,转化成难溶盐
D.
加入CaCl 2 使pH降低,转化成难溶盐
E.
加入NaCl与镉元素结合