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【单选题】
How can a student help the teacher?A.
By collecting or handing out papers.
B.
By following the teacher to the office.
C.
By talking loudly in class.
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举一反三
【单选题】You should let your children play ______ you can see them.
A.
where
B.
when
C.
in which
D.
that
【简答题】分离到一种突变型噬菌体，其DNA具有以下性质：(1)从该噬菌体提取的DNA沉降时表现为单一组分(A结构)，其沉降系数不大受离子强度的影响；(2)A分子不与甲醛反应，且吖啶类化合物使其粘度增加而使沉降系数下降；(3)在pH12.5条件下沉降时表现为两种组分，沉降快的组分的量是慢的组分的两倍(根据吸收值测定)；(4)若将A加热至低于解链温度10℃再迅速冷却，可得到B和C两种组分，其沉降系数不同；但若慢...
【单选题】2-10 下列说法中正确的是:
A.
物体静止时物体所受外力一定为零；
B.
物体速度越大，加速度就越大，所以所受合力就越大；
C.
物体的质量与合外力成正比，与加速度成反比；
D.
当物体速度越来越大时，只要加速度不变，则所受合外力不变。
【单选题】who wants to live forever? If your doctor could give you a drug that would let you have a healthy life for twice as long，would you take it? The good news is that we may be drawing near to that date．Sc...
A.
Spending more time with his family．
B.
Having more education．
C.
Realizing more dreams．
D.
Working longer．
【简答题】I’ll never forgive you if you let ___ that I was late.
【单选题】He was willing to go and work where ______.
A.
needed
B.
needs
C.
needing
D.
he needs
【单选题】2-4 下列说法中正确的是:
A.
物体静止时物体所受外力一定为零
B.
物体速度越大，加速度就越大，所以所受合力就越大
C.
当物体速度越来越大时，只要加速度不变，则所受合外力不变
D.
物体的质量与合外力成正比，与加速度成反比
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【单选题】You should let your children play ______ you can see them.
A.
where
B.
when
C.
in which
D.
that
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