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【单选题】
The shop attendant says that in her shop there aren’t any plastic bags. Why do you think this is the case?
A.
Because plastic bags are expensive, and customers don’t want to pay for them.
B.
Because plastic bags are bad for the environment.
C.
Because her customers prefer reusable shopping bags.
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举一反三
【单选题】It’s just a petty mistake.
A.
maior
B.
important
C.
serious
D.
minor
【单选题】蛋糕的全蛋搅拌法是将糖与全蛋液一起搅打,至体积增大()倍左右,加入过筛面粉成面糊的工艺方法
A.
B.
C.
D.
【简答题】Why did humans evolve to walk upright? Perhaps because it’s just plain easier. Make that “energetically less costly”, scientifically speaking. Bipedalism—walking on two feet, is one of the defining ch...
【简答题】判断下列曲面的类型,并说明是否为旋转曲面: (1)x 2 +2y 2 =z 2 -3;    (2)x-2y 2 +2z 2 =0; (3)2x 2 -3y 2 =3z 2 -1;    (4)x 2 +5y 2 =1-z 2 ; (5)2-x 2 =z 2 -y。
【简答题】将二次曲面x2+3y2+3z2+2y2-1化为标准形,并指出曲面类型。
【单选题】It’s me why some people are crazy about iPhone. It’s just a means of communication.
A.
above
B.
under
C.
beyond
D.
over
【多选题】植物化学保护学是研究科学地应用农药来防治()、线虫、鼠类等有害生物,保护农、林业生产的一门科学
A.
害虫
B.
害螨
C.
病原菌
D.
杂草
【判断题】蛋糕的全蛋搅拌法是将糖与全蛋液一起搅打,制体积增大3倍左右,加入过筛面粉成面糊的工艺方法。
A.
正确
B.
错误
【单选题】蛋糕的全蛋搅拌法是将糖与全蛋液一起搅打,至体积增大三倍左右,加入过筛()成面糊的工艺方法
A.
油脂
B.
泡打粉
C.
面粉
D.
乳化剂
【单选题】旋转曲面3x2+3y2-z2=1的转轴与母线分别为( )
A.
x轴;xoy面上曲线3x²+3y²=1
B.
y轴;yoz面上曲线3y²-z²=1
C.
z轴;xoy面上曲线3x²+3y²=1
D.
z轴;xoz面上曲线3x²-z²=1
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