1.选择题- (共7题)
5.科学研究表明地球的自转在变慢.四亿年前,地球每年是400天,那时,地球自转的周期为21.5h,科学家们猜想,地球自转变慢的原因主要有两个:一个是潮汐时海水与海岸碰撞、与海底摩擦而使能量变成内能;另一个是由于潮汐的作用,地球把部分自转能量传给了月球,使月球的机械能增加了(不考虑对月球自转的影响),由此可以判断,与四亿年前相比,现在月球绕地球公转的
2.单项选择- (共6题)
8.
My father served in the army in when he was in .
A.1950s; twenties | B.the 1950s; his twenties |
C.the 1950s; the twenties | D.1950s; the twenties |
9.
John rushed out in a hurry, ___________ the door ____________.
A.leaving; unlocked | B.leaving; unlocking |
C.left; unlocked | D.sang; singing |
10.
The teacher couldn’t make himself attention to because the students were so noisy.
A.to pay | B.to be paid | C.paid | D.pay |
11.
---What is our earth like ________from the moon?
---Well, our earth, with water ________ 70% of its surface, appears as a "blue ball".
---Well, our earth, with water ________ 70% of its surface, appears as a "blue ball".
A.seen; covering | B.seen; to cover |
C.seeing; covered | D.seeing; covering |
12.
The two biologists debated ________ each other for years ________ the origin of species.
A.with; about | B.about; for | C.between; over | D.to; for |
试卷分析
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【1】题量占比
选择题:(7道)
单项选择:(6道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:0
7星难题:0
8星难题:6
9星难题:0