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【单选题】
对喉的结构和功能的叙述正确的是（ ）。 ①喉由多块软骨组成 ②喉是气体和食物的共同通道 ③喉是发声器官 ④喉腔位于咽和气管之间A.
①②
B.
③④
C.
①③
D.
②④
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举一反三
【单选题】I'm sure he hasn't sent the letter. If he ______ it, I ______ .
A.
sent, got
B.
sent, have got
C.
sent, would go
D.
had sent, would have got
【多选题】病毒的微生物学特征有（）。
A.
只含有一种核酸，DNA或RNA，为单股或双股
B.
严格的细胞内寄生，没有完整的酶系统，不能独立的进行生长和繁殖
C.
对一般的抗生素和作用于微生物代谢途径的药物敏感
D.
没有核糖体和转运RNA，无合成蛋白质所必须的酶
【单选题】Wre sent a telegram yesterday as we______any letter from him for a long time.
A.
haven't received
B.
didn't receive
C.
hadn't received
D.
would not receive
【单选题】What did Goodyear do as the first step to fight against absenteeism?
A.
They sent a letter to each employee's home through the post office.
B.
They sent letters to employees' homes in person.
C.
They gave away prizes first.
D.
They punished its employees severely.
【简答题】What was sent to the receiver of the letter?
【简答题】He sent me _____ letter, but _____ letter didn't arrive.
【单选题】I' m sure the letter won' t arrive in time ______ it is sent by air.
A.
if
B.
until
C.
because
D.
unless
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