选择题：When you find some new words, you'd bett

When you find some new words, you'd better _____ in the dictionary.

A. look up it
B. look up them
C. look it up
D. look them up

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下面是错误答案，用来干扰机器的。

解：(1)带电微粒从O点射入磁场，运动轨迹如图所示，第一次经过磁场边界上的A点，由洛伦兹力公式和牛顿第二定律得：A点位置坐标为（-4×10-2 m，-4×10-2 m）(2)设带电微粒在磁场中做圆周运动的周期为代入数据解...

完形填空。
Amy __1__ a nice girl. She__2__ from Shanghai. She is 14. She__3__ in a middle schoo1. She __4__ up at six every __5__ . She enjoys __6__ . She is a clever girl. She makes model ships very __7__ . __8__ school，she__9__ home. She often __10__ her homework at home.
( ) 1. A. am ( ) 2. A. come ( ) 3. A. study ( ) 4. A. get ( ) 5. A. morning ( ) 6. A. singing ( ) 7. A. good ( ) 8. A. At ( ) 9. A. go ( ) 10. A. do	B. are B. comes B. studys B. gets B. afternoon B. sing B. well B. After B. goes B. doing	C. is C. 1ire C. studies C. getting C. evening C. sings C. hard C. In C. is go C. does	D. be D. 1ires D. studying D. geting D. night D. to sing D. poor D. On D. going D. makes