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【单选题】
I should convey my appreciation to my high school teachers, without ____ help I wouldn’t achieve such a big success.A.
whom
B.
them
C.
which
D.
whose
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皮皮学刷刷变学霸
举一反三
【单选题】下列有关群落初生演替和次生演替的叙述中,错误的是
A.
两种演替经历的阶段不完全相同
B.
次生演替的速度一般比初生演替快
C.
两种演替一般都朝向与环境相适应的方向进行
D.
两种演替总会使群落中物种丰富度增大、结构更复杂
【单选题】There is a police car in front of the house of our neighbour's. _____ do you think _____ ？
A.
What；has happened
B.
What；of happening
C.
What；of being happened
D.
Whatever；of happening
【简答题】在公式s=vt+5t 2 中，已知s、t（t＞0），那么v=______（用s、t的代数式表示）．
【简答题】在公式s=50t中常量是______，变量是______．
【单选题】There has been no _____ so far from the police about the cause of the poor girl's death after the college entrance examination. [ ]
A.
comment
B.
command
C.
discussion
D.
reaction
【单选题】She's a police officer, so she has to wear a ________ at work.
A.
uniform
B.
police suit
C.
dress
D.
clothes
【简答题】在公式v=av 0 +2t中，已知v=100，v 0 =20，t=4，则a=______．
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