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【单选题】
装氧气表前打开总开关的目的是A.
检查筒内是否有氧气
B.
测知筒内氧气压力
C.
清洁气门、保护氧气表
D.
估计筒内氧气流量
E.
了解氧气流出是否通畅
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举一反三
【简答题】What did Mr. Jones ask the students to do? Mr. Jones asked the students to write ______ in the class.
【单选题】Why does Ms. Tucker write the letter?
A.
To ask Mr. McGuire for a donation
B.
To invite Mr. McGuire to an event
C.
To inform. Mr. McGuire about a program
D.
To encourage Mr. McGuire to visit the shelter
【简答题】Where can Mr. Spencer find the details of the discount Walter Stevens normally gives? In ______.
【单选题】Mr. Bussell is a good teacher, but he often gives ______ lectures.
A.
excellent
B.
sound
C.
extensive
D.
tedious
【单选题】Mr. Smith asked Jenny some new words and let her to on the blackboard. [ ]
A.
write them down
B.
write it down
C.
write down it
D.
write down them
【简答题】Why does the author write to Mr. Lee? The author writes to Mr. Lee to seek______ .
【简答题】一个半径为r、以速度v运动的小球所受到的空气阻力可以表示为 f(v)=3.1×10 -4 rv+0.87r 2 v 2 这是一个对很宽的速度区间都有效的公式。其中，f(v)的单位为牛顿，r的单位为米，v的单位为米/秒。把雨滴看作在空气中运动的小球，求雨滴下落的收尾速度表示式，并计算一个半径为2毫米的雨滴的收尾速度。
【单选题】_______ Mr. Smith is not rich, ________he always gives money to the poor.
A.
Although ; /
B.
Although ; but
C.
But ; although
D.
Because; /
【单选题】Mr. Smith asked Jenny some new words and let her on the blackboard. [ ]
A.
write them down
B.
write it down
C.
write down it
D.
write down them
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