[单项选择]—How long ______ each other before they ______ married —For about a year.
A. have they known, get
B. did you know, were going to get
C. do you know, are going to get
D. had they known, got

[单项选择]—How long ______ each other before they ______ married —For about a year.
A. have they known; get
B. did they know; were going to get
C. do they know; are going to get
D. had they known; got

[单项选择]They are said______each other long time before they met in Harvard University where they worked together on a research project.
A. to know
B. to have known
C. knowing
D. having known

[单项选择]How long does each business cycle last, according to the president
A. 10 years.
B. 14 or15 years.
C. 25 years.
D. 50 years.

[单项选择]Nobody yet knows how long and how seriously the shakiness in the financial system will ______ down the economy.
A. settle
B. knock
C. put
D. drag

[单项选择]Nobody yet knows how long and how seriously the ______ in the financial system will drag down the economy.
A. shallowness
B. shakiness
C. scantiness
D. stiffness

[单项选择]

Text 3 People have wondered for a long time how their personalities and behaviors are formed, h is not easy to explain why one person is intelligent and another is not, or why one is cooperative and another is competitive. Social scientists are, of course, extremely interested in these types of questions. They want to explain why we possess certain characteristics and exhibit certain behaviors. There are no clear answers yet, but two distinct schools of thought on the matter have developed. As one might expect, the two approaches are very different from one another, and there is a great deal of debate between proponents of each theory. The controversy is often referred to as "nature/nurture". Those who support the "nature" side of the conflict believe that our personalities and behavior patterns are largely determined by biological and genetic factors. That our environment has little, if anything, to do with our abilities, characteristics, and behavior
A. Person's character is greatly influenced by his environment
B. Behaviorist theory is not correct
C. Biologically based instincts are important in how we act
D. Environment has little to do with behavior

[单项选择]How long ______ each other when they got married
A. had they known
B. have they known
C. would they know
D. did they know

[单项选择]How long can elephants live

[单项选择]How long will the trip take


A. 7 hours.
B. Half a day.
C. The whole day.
D. All weekend.

[单项选择]How long will the course take
A. 5 weeks.
B. 10 weeks.
C. One month.
D. Two months.