花径育种较其它育种目标难实现。（)

A.as time

B.through time

C.during time

D.over time

Most couples are about the same age, to be equally good-looking, to have similar IQ scores and so on.

A．If it looks like they have these same traits, we will take the risk of hiring them．

B．If it looks like they share the same traits, we will make them headhunters．

C．It they look like experienced staff; we will allow them to run a risk．

D．If they show the proper quality, it will be a gamble to look for them．

riends. As we get to know people, we consider things like age, races, looks and social positions. Thus it is more difficult for people to become friends if there is a big difference in age and background. However, some people don&39;t think these factors are of the most importance.

From the passage we can conclude that______.

A．different people have different ideas about the same thing

B．Westerners culture is similar to our Chinese culture

C．in general, Westerners and the Chinese don't like pigs

D．all of the Chinese like pigs better than Westerners

We have to work even harder though we feel quite ______ our success.

A．secure of

B．nervous about

C．worried about

D．competent for

We'd better have our meals______.

A．at the same time each day

B．when our work is over

C．when the meal is still hot

D．when every one of the family is home

We had better have our meals

A. when our work is over

B. at the same time each day

C. when the meal is still hot

D. when we go back home