[单项选择]This term the students have learned ______ last term.
A. twice as many new words as B. as many new words twice as
C. twice as much new words as D. twice as more new words as

[单项选择]This term the students have learned ______ last term.


A. twice as many new words as
B. as many new words twice as
C. twice as much new words as
D. twice as more new words as

[单项选择]Some of the students have already learned enough English to（　）a conversation with a native English speaker.
A. carry on
B. keep on
C. go on
D. hold on

[单项选择]Last term candidates were not allowed to bring books into the examination room（）
A. 前一条款规定，候选人不准带书进入考场。
B. 上学期，候选人不准带书进入考场。
C. 上学期，考生不准带书进入考场。
D. 前一条款规定，考生不能带书进入考场。

[单项选择]Both countries have been making efforts to ease tension.


A. stop
B. decrease
C. relieve
D. analyze

[单项选择]Since last term, each of them （　） an English dictionary.
A. had
B. has
C. has had
D. have had

[单项选择]　　 Scientists have discovered that for the last 160,000 years, at least, there 　　has been a consistent relationship between the amount of carbon dioxide in the air 　　and the average temperature of the planet. The importance of carbon dioxide in 　　regulating the Earth’s temperature was confirmed by scientists working in eastern (5) Antarctica. Drilling down into a glacier, they extracted a mile-long cylinder of ice 　　from the hole. The glacier had formed as layer upon layer of snow accumulated year 　　after year. Thus drilling into the ice was tantamount to drilling back through time. 　　The deepest sections of the core are composed of water that fell as snow 160,000 years 　　ago. Scientists in Grenoble, France, fractured portions of the core and temperature and of atmospheric (10)measured the composition of ancient air released from bubbles in the ice. Instruments 　　were used to measure the ratio of certain isotopes in the frozen water to get an idea 　　of the p
A. Chemical causes of ice ages
B. Techniques for studying ancient layers of ice in glaciers
C. Evidence of a relationship between levels of carbon dioxide and global temperature
D. Effects of plant life on carbon dioxide levels in the atmosphere

[单项选择]It must have rained last night, （　） the ground is wet.
A. because    
B. as     
C. since   
D. for

[单项选择]It must have rained last night, （） the ground is wet.
A. because
B. as
C. since
D. for