生态系统中,绿色植物固定的太阳光能沿着食物链的单向传递叫做( ) A.能量输入

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问题:

生态系统中,绿色植物固定的太阳光能沿着食物链的单向传递叫做(  )

A.能量输入

B.能量输出

C.能量流动

D.能量交换

考点:生态系统的功能
题型:选择题

控制好乙苯精馏塔灵敏板温度是保证乙苯产品合格的关键。()

题型:选择题

某患者,带下过少,阴中干涩,头晕眼花,心悸失眠,神疲乏力,经行腹痛,舌质暗淡,边有瘀斑,脉细涩。方用

A.血府逐瘀汤

B.左归九加知母、肉苁蓉、紫河车、麦冬

C.少腹逐瘀汤

D.小营煎加丹参、桃仁、牛膝

E.左归饮加三棱、莪术

题型:选择题

人体的各种消化液中,既有消化作用,又有免疫作用的是 [ ]

A.唾液          

B.肠液         

C.胆汁        

D.胰液

题型:选择题

把食品冷冻可以杀死致病菌。

题型:选择题

I was a single parent of four small children, working at a low paid job. Money was always tight, but we had a (1) over our heads, food on the table, clothes on our backs, and if not a lot, always (2) . Not knowing we were poor, my kids just thought I was (3) . I’ve always been glad about that.

It was Christmas time, and although there wasn’t (4) for a lot of gifts, we planned to celebrate with a family party. But the big (5) for the kids was the fun of Christmas (6) .

They planned weeks ahead of time, asking (7) what they wanted for Christmas. Fortunately, I had saved MYM120 for (8) to share by all five of us.

The big (9) arrived. I gave each kid a twenty-dollar bill and (10) them to look for gifts of about four dollars each. Then everyone scattered. We had two hours to shop; then we would (11) back at the "Santa’s Workshop".

Driving home, everyone was in high Christmas spirits, (12) my younger daughter, Ginger, who was unusually (13) . She had only one small, flat bag with a few candies—fiftycent candies! I was so angry, but I didn’t say anything (14) we got home. I called her into my bedroom and closed the door, (15) to be angry again. This is what she told me.

"I was looking (16) thinking of what to buy, and I (17) to read the little cards on the ’Giving Trees’. One was for a little girl, four years old, and all she (18) for Christmas was a doll. So I took the card off the tree and (19) the doll for her. We have so much and she doesn’t have anything. "

I never felt so (20) as I did that day.

5()

A.improvement 

B.problem 

C.surprise 

D.excitement

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