X-rays have a shorter wavelength than light rays.

A．He prefers shorter plays to this one.

B．He doesn't have to go to that play.

C．He wouldn't see the play as the woman did.

D．He liked the play better the first time he saw it.

A、greater the availability of close substitutes.

B、more broad the definition of the market.

C、shorter the period of time.

D、more it is regarded as a necessity.

A．Y

B．N

C．NG

A．Because they take shorter to use.

B．Because they have more accurate spelling.

C．Because they can make you have a longer memory of the information.

D．Because they can give you a clearer explanation of the language points.

A．People have to work early on their weight.

B．Overweight people have shorter life expectancies.

C．Smoking is damaging to life expectancy.

D．If people are overweight by their mid-30's to mid-40's, if they lose some weight later on, they will carry a lower risk of dying.

A．Asians came to the United States only in recent years

B．Asians are taller than immigrants from other areas

C．the immigration by people with shorter average height is not large enough

D．immigrants of other ethnicities usually have good access to medical care and nutrition

A．we should not study for long hours every day

B．reviewing what we have studied is of little help

C．the shorter the interval is, the better we'll study

D．doing repetition at intervals is the best way

A．Can you make the meeting with Mrs. Chen any shorter？

B．Can you start the meeting with Mrs. Chen any earlier？

C．Can you have the meeting with Mrs. Ohen any sooner？