现代系统安全理论认为，危险源产生的根源来自于（），以及管理及环境缺陷等方面。 A.人

U.S.A. Weather Report of May 13

City	Weather              ℉
DETROIT	Clouds early 　 Maybe a shower, and then skies clear up. High: 73° Low: 43° Tomorrow: sunny to partly cloudy. High: 66° Low: 45°
BOSTON	Staying cool　 More clouds than yesterday. Cool east wind. High: 65° Low: 51° Tomorrow: showers in the afternoon; then clearing. High: 69° Low: 47°
LOS ANGELES	Not bad　 Some morning clouds; then a sunny afternoon. High: 78° Low: 61° Tomorrow: warmer. High: 81° Low: 65°
PHILADELPHI	A Mainly sunny A few clouds; then showers tonight. High: 75° Low: 57° Tomorrow: clouds early; then heavy rain. High: 76° Low: 52°
WASHINGTON D.C.	Sunny intervals(间隔) Some clouds, and heavy rain tonight. High: 77° Low: 60° Tomorrow: cloudy to partly sunny. High: 77° Low: 54°

 
小题1:Which city was sunny to partly cloudy on May 14?
A. WASHINGTON D.C.             B. LOS ANGELES.
C. DETROIT.                   D. BOSTON.
小题2:When did BOSTON have showers?

A．On the afternoon of May 13.	B．On the morning of May 13.
C．On the afternoon of May 14.	D．On the morning of May 14.

小题3:Which’s TRUE about the weather in LOS ANGELES?
A. It was cooler than WASHINGTON D.C. on May 13.
B. It was warmer on May 14 than on May 13.
C. It was cloudy on the afternoon of May 13.
D. It was sunny on the morning of May 13.
小题4:Which picture represents the weather on the night of May 13 in PHILADELPHIA?
 
小题5:What did most people probably do in PHILADELPHIA on May 13 at night?

A．Enjoyed looking at the moon.	B．Went for a walk.
C．Did sports outside.	D．Stayed at home.