【单选题】
The birth rate of the country decreases ______ with years.
①
extremely
②
approximately
③
progressively
【单选题】
By the middle of the 21st century, the vast majority of the world’s population ____ in cities rather than in the country.
①
are living
②
will be living
③
have lived
④
will have lived
【单选题】
36.It was not until 1920 _____regular radio broadcasts began.
①
while
②
which
③
that
④
since
【单选题】
The car beeped at me until I fastened my seatbelt.
①
A.汽车向我发出了嘟嘟的声音，直到我系上了安全带。
②
B.汽车发出嘟嘟的声音，我系上安全带就不响了。
③
C.汽车在我系上安全带之前才发出嘟嘟的声音。
④
D.汽车发出嘟嘟的声音，我才系上了安全带。
【单选题】
Not until all the fish died in the river ___ how serious the pollution was.
①
did the villagers realize
②
the villagers realized
③
the villagers did realize
④
didn’t the villagers realize
【单选题】
For thousands of years man dreamed （） seemed impossible dreams about flying.
①
what
②
that
③
which
④
why
【单选题】
When you send a letter or a postcard, you have to put_________ on th envelope or on the card.
①
mails
②
parcels
③
receipts
④
stamps