新陈代谢是人和生物________的基本条件，是生命的基本特征。

目前，《第一套全国中小学校园集体舞》开始在全国中小学全面推广。开展校园集体舞活动[ ]

①有助于学生愉悦身心，培养健康的审美情趣

②有助于改善学生身体形态和机能，提高身体素质

③有助于培养学生的集体主义精神，培养学生的合作意识和交际能力

④会使学生萌发对异性的好感或爱慕之情，必然引发早恋，不利于学生的健康成长

A．②③④

B．①②③

C．①②④

D．①③④

一辆汽车行驶在如图半径为R的半圆路面上，当它到达顶端A时

A.速度不大于即可

B.速度如果等于，汽车将做平抛运动

C.汽车速度只有小于才能安全通过

D.以上说法都不对

I am Jack. I am fond of painting on T-shirts. I got the idea two years ago for my brother’s birthday present. T-shirts in the shops were expensive. So I decided to paint a T-shirt myself. I bought a white cotton T-shirt for $ 6 and some paints. I painted a lion on the front. My brother loved it!

Painting T- shirts is great fun. You needn’t be a great artist (艺术家). You can just paint shapes and lines. The T-shirts are the most expensive part of my hobby. I love my hobby because I can make T-shirts that no one else has got. I give a lot of them away as presents to my family and friends. Sometimes, I sell them. I’ve made about 60 T-shirts and each one is different.

小题1: What does Jack like doing?

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小题2:Who got the first painted (画好的)T-shirt

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小题3: How many T-shirts has Jack made?

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小题4: Are all the T-shirts the same?

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小题5: What does Jack feel about painting T-shirts?

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下列属于短期筹资的特点是（）。

A．筹资速度快

B．筹资弹性好

C．筹资成本较低

D．筹资对象广

E．筹资风险低

色甘酸钠预防哮喘发作的机制是（）

A.稳定肥大细胞的细胞膜，抑制过敏介质释放

B.直接松弛支气管平滑肌

C.对抗组胺、白三烯等过敏介质

D.具有较强的抗炎作用

E.阻止抗原和抗体结合